Multi-volume oil switches. Main characteristics of oil switches Oil switch manual transmission 35 device
We have collected maximum information and documentation on the oil switch MKP-110 (M, B) - passports, instructions for spare parts and other documents.
Factory documentation, passport, instructions and other documents for MKP-110
MCP 110 decoding- Oil Chamber Substation,
110 - rated voltage, kV,
1000/630 - rated current, A
20 - rated breaking current
U - climatic version
Technical characteristics of MKP-110-M (MP):
| Rated operating voltage, kV | |
| Maximum operating voltage, kV | |
| Rated current, A | |
| Shutdown current, kA | |
| Shutdown power, MVA | |
| Limit through current: effective value, kA amplitude value, kA |
|
| Thermal stability current, kA for time interval: 1 s 5 s 10 s |
29 |
| Switch-off time at rated voltage, s | |
| Arc extinguishing time in the chamber, s | |
| Own shutdown time (from the moment the command is given for contact divergence), s | |
| Accompanying current extinguishing time in the shunt, s |
no more than 0.08 |
| Cycle time of instantaneous automatic reclosure (from the moment the shutdown command is given until the contacts are closed again), s: for switch M for MP switch |
0,7-0,8 |
| Weight of MKP-110-M switch with drive and 12 current transformers without bushings and oil, kg |
Factory passport MKP-110-1000/630-20U1 and 110M-1000/630-20U1, 110-MP
Switches of types MKP-110-1000/630-20U1 and MKP-110M-1000/630-20U1 are designed for switching operational currents and short-circuit currents. V electrical networks. The switch is installed on open distribution devices(ORU) stations and substations of energy systems for a rated voltage of 110 kV AC frequencies 50 or 60 Hz.
Terms of Use.
The altitude above sea level is not more than 1000 m, the ambient temperature is not higher than +40 (with an average daily temperature not higher than +35 degrees C) and not lower than minus 40 degrees. C (occasionally minus 45C), wind speed in the absence of ice - up to 40 m/s, in case of ice with an ice crust thickness of up to 20 mm - up to 15 m/s, tension of wires in the horizontal direction in the plane of the inputs - up to 100 kg*s.
The circuit breaker is controlled by a suspended DC drive, type ShPE-33, common to three poles.
Difference between MKP-110 and MKP-110M
The letter M denotes a version with separate tanks, without M - a version on a common frame.
Switch type MKP-110-1000/630-20U1 is a three-pole device, the poles of which are installed on a common welded frame and are rigidly connected. The switch is installed on a standard foundation.
The MKP-110-1000/630-20U1 type switch is a three-pole device, consisting of three separate poles connected by spacers.
Each switch is equipped with built-in current transformers of type TV-110-20U2 or TVU-110-50U2, climatic version U, placement category 2 according to GOST 15150-69, as well as BMPU/15 - 110/1000U1 inputs of reinforced design, category B.
MKP-110B-1000/630-20U1. Operating instructions and technical description. 2SYA.025.056. THAT
The switch consists of three poles connected into a single unit using studs, pipes and connecting rods located in them. A pole is a cylindrical tank with angles welded to it for lifting and fastening the tanks together with connecting pins.
The set of components is designed to modernize a high-voltage circuit breaker in order to increase its breaking capacity from 3500 to 4750 mVA, the limiting breaking current from 18.3 to 25 kA in a double automatic reclosing cycle at a rated current of 1000 or 600 A.
Set of units M-I-MCP-110.5-35.5. Passport. 8ES-00.00.000 PS
Set of units M-I-MKP-110.5-35.5 for modernization of high-voltage oil circuit breakers. This set of components is intended for upgrading the MKP-110-5 type circuit breaker in order to increase the rated breaking current to 35.5 kA.
Modernization consists of replacing cameras and resistors with new ones that differ in design, and the lengths of the rods should be changed.
Reinforcement details for MKP-110M. Passport
Instructions for strengthening switches with UPI cameras.
An increase in the maximum shutdown current has been achieved through the use of new cameras effective system multiple longitudinal blast with a symmetrical arrangement of exhaust slits and installation of spring-piston discharge tanks in the chambers. The use of reservoirs allows you to limit the pressure in the chambers when turning off high currents short circuit, which reduces the load on the inputs and foundation of the circuit breaker.
More materials on the switch:
Repair acceptance program
Purpose of the work:
Study of the design and operating principle of multi-volume oil switches.
Basic concepts:
Oil switch- a switching device designed for quickly turning on and off individual circuits or electrical equipment in the power system, in normal or emergency modes, with manual or automatic control. Arc extinguishing in such a switch occurs in oil.
Classification
Low oil (pot)
According to the operating principle of the arc extinguishing device:
with auto-blowing (pressure and movement of oil and gas occurs under the influence of energy released from the arc)
with forced oil blast (oil is pumped to the rupture site using special hydraulic mechanisms)
with magnetic quenching in oil (the arc moves into narrow channels under the influence of a magnetic field)
Tank switches
They consist of inputs, contact and arc extinguishing systems, which are placed in a tank filled with oil. For voltages of 3-20 kV they are single-tank (three phases in one tank) with manual or remote control, and for voltages 35 kV - three-tank (each phase in a separate tank) with remote or automatic control, with an automatic recloser (AR). The oil insulates the phases from each other (for single-tank ones) and from the grounded tank, and also serves to extinguish the arc and isolate the gap between the contacts in the off state. When the switch is tripped, the contacts of the arc chutes first open. The electric arc that occurs when these contacts open decomposes the oil, while the arc itself ends up in a gas bubble (up to 70% hydrogen), which has high blood pressure. Hydrogen and high pressure in the bubble promote deionization of the arc. On circuit breakers for voltages above 35 kV, a blast is created in the arc extinguishing chambers. The arcing system may have multiple breaks, which increase the rate at which the arc stretches relative to the rate at which the contacts diverge. The ruptures can be placed in arc-extinguishing chambers designed to create an intense gas blast (the blast can be longitudinal or transverse, depending on the direction of movement of the oil relative to the arc). To equalize the voltages (the size of the arcs) at the contacts, the breaks are bridged. After the arc goes out, the traverse contacts open, interrupting the current flowing through the shunts.
Advantages of tank switches:
simplicity of design
high breaking capacities
Flaws:
large dimensions
large volume of oil
explosion and fire hazard
Multi-volume(tank) oil circuit breakers were initially the only type of disconnecting devices in high voltage networks until the mid-30s. In circuit breakers of this type, each phase is provided with a separate grounded steel tank filled with transformer oil, which is used as a gas-generating substance when extinguishing the electric arc during the shutdown process, as well as to isolate the contact system from the grounded tank. Switches are used in electrical installations with voltages of 35, 110 and 220 kV.
Multi-volume oil switch MKP-35
A– appearance:
3 – drive;
4 – winch
b– switch phase section:
1 – arc-extinguishing chamber;
2 – insulation of the chamber and tank;
4 – traverse;
5 – insulation of inputs;
6 – rod;
7 – moving contact;
8 – current transformer
It consists of three tanks 1 oval shaped, mounted on a welded frame 2 . The circuit breaker is controlled by a drive in the cabinet 3 . A winch is used to lower and raise the tanks 4 .
An arc-extinguishing chamber is attached to the current-carrying rod of each input using two holder bolts 4. The chamber is closed with an insulating screen 1. The upper part of the chamber is metal (steel, brass), the lower part is assembled from insulating plates 9, which have special profile cutouts. When assembled, the plates are pulled together with textolite pins and form a Chamber, which has a central vertical channel with a neck 8. for the passage of the movable contact and two horizontal channels of the transverse blower with exit to the oil tank.
Arcing chamber of MKP-35 switch
A– camera section:
1 – bakelite cylinder and plates;
2 – flexible connection;
3 – spring;
4 – holder;
5 – gas cushion cavity;
6 – body;
7 – contact;
8 – chamber neck;
9 – insulating plates
b– arc extinguishing process:
1 – body;
2 – cavity of the gas cushion;
3, 4 – contacts;
5 – insulating plates;
6 – transverse slots
End type switch contacts. Their closure occurs in the upper part of the chambers, which has a metal body 6, in which there is a fixed contact 7. Spring 3 serves to soften shocks, prevent vibrations when turned on and create contact pressure in the on position. Flexible connection 2 ensures good contact between the moving and fixed parts of the upper contact system (fixed contact). In the upper right part of the chamber there is a compartment 5 in which, when the tank is filled with oil, air remains, forming a buffer gas cushion. When contacts 3 and 4 open, an arc appears in the upper part of the chamber, which stretches following the movable contact 4, decomposes and evaporates the oil. The pressure in the main chamber increases sharply, since the exit from the chamber is blocked by the movable contact rod. The pressure is transferred to compartment 2, where the air of the gas cushion is compressed. The moving contact, as it moves downwards, alternately opens the horizontal channels 6 of the transverse blast, into which oil and gases from the upper part of the chamber rush under high pressure. In this case, the arc stretches in a zigzag manner in the channels, intensively deionizes and goes out. Extinguishing occurs in two arc extinguishing chambers simultaneously, that is, two breaks in the electric arc are created for each phase, due to which the shutdown process is significantly accelerated (toff = 0.08 s). The MKP-35 switch is a high-speed switch. Intense deionization of the arc and its rapid extinguishing occur due to the following factors: the presence of hydrogen in the gas bubble that arises during the decomposition of the oil; high pressure in the gas bubble; stretching the arc in the longitudinal and transverse directions; two current circuit breaks per phase; passing of alternating current through zero.
The most important role in the operation of the switch is played by the buffer space, located in the upper part of the tank above the oil and filled with air. It allows the oil to expand upward, which reduces the pressure on the walls and bottom of the tank. If this space is not enough ( high level oil), the tank may explode. When the oil level in the tank is low, hydrogen, which is part of the gases released and has high temperature, rising upward, does not have time to cool, and combining with oxygen in the air in the buffer space, can cause an explosion. Consequently, a switch explosion can occur both when the oil level rises and falls. During operation, the oil level is monitored; for this purpose, the tanks have oil indicators.
MINISTRY OF ENERGY AND ELECTRIFICATION OF THE USSR
GLAVENERGOREMONT
MANAGEMENT
FOR OVERHAUL REPAIRS
OIL SWITCH
MKP-35-1000-25
RD 34.47.604
SERVICE OF EXCELLENCE FOR SOYUZTEKHENERGO
Moscow 1986
AGREED: I CONFIRM:
Deputy Director
for scientific work
Research Institute of Software Chief Engineer
"Uralelektrotyazhmash" Glavenergoremont
A.I. Utkin V.I. KURKOVICH
1. Introduction
1.1. The manual for the overhaul of the oil switch MKP-35-1000-25* is a technical document, compliance with the requirements of which is mandatory for personnel performing overhaul of the switch.
*Hereinafter referred to as the Guide for brevity.
1.2. The manual provides for the use of the most rational forms of organizing repair work and advanced technological methods for their implementation.
1.3. The Guide contains:
a) technical requirements for volume and quality repair work and to the methods of their implementation (regardless of the organizational and technical level of repair units);
b) method of control during the repair of parts and assembly units;
c) rules for accepting equipment for repair and repair;
d) criteria for assessing the quality of repair work.
1.4. The guide is based on technical documentation manufacturer.
2. Organization of work to repair the circuit breaker
2.1. General provisions
2.1.1. The composition of the team (link) for repairing the circuit breaker is established depending on the intended scope of work (the duration of repair work is determined by the network repair schedule).
2.1.2. The timing of repair work should be determined taking into account the following:
a) the composition of the brigade must correspond technological scheme repair. Changing the composition of the team until the repair is completed is not allowed;
c) to ensure the completion of repair work within the established time frame, it is recommended to issue standardized task plans and use the aggregate-unit method of repair using the exchange stock of parts;
d) the work schedule of repair personnel should be subject to the maximum reduction in the duration of repair work.
2.1.3. The manual provides for a repair team of 4 people: electricians of the 5th category - 1 person, 3rd category - 2 people, 2nd category - 1 person.
2.1.4. Labor costs for overhaul of the circuit breaker are determined on the basis of the “Time Standards for Overhaul, current repairs and operational maintenance of equipment for substations 35 - 500 kV and distribution networks 0.4 - 20 kV", approved by the USSR Ministry of Energy in 1971.
Standards for overhaul of oil switch MKP-35-1000-25 (without changing inputs) - 41.8 man-hours, with changing inputs - 52 man-hours.
2.2. Preparation for repair
2.2.1. Preparation for major repairs is carried out in accordance with the specific scope of work provided for this type of equipment.
2.2.2. Before the start of repairs, a team of workers with appropriate qualifications who have undergone training, knowledge testing and instructions on the rules of safe work is staffed.
2.2.3. Before starting work, the team is given a planned task with a specific list of work and an indication of its volume, labor costs and completion date, as well as technological instructions and requirements.
2.2.4. Before starting repairs you must:
a) prepare a set metalworking tools, as well as instruments and measuring instruments (applications,);
b) prepare basic and auxiliary materials, spare parts for repairs (applications, ); The list and quantity of materials should be specified in accordance with the scope of work;
c) prepare and check protective equipment;
d) coordinate the work procedure with other teams performing related work.
2.2.5. The performers, together with the repair manager, after drawing up a general work order for the repair of the circuit breaker, must:
a) make sure that it is correct and full implementation all measures to ensure work safety;
b) carry out all fire safety measures.
2.3. Quality control of repair work
2.3.1. Quality control of repair work by the contractor is carried out in the following order:
a) check, together with the repair manager, the condition of each assembly unit during the repair. In this case, the manager must give instructions on repair methods and supplement (clarify) the technical requirements for repairs, according to which the assembly unit will be accepted from repair and the quality of repair work will be assessed;
b) present completed hidden work and completed intermediate operations to the manager for acceptance and quality assessment;
c) after completing all repair work, present the circuit breaker for final acceptance.
2.3.2. The final acceptance of the product as a whole is carried out by representatives of the operational department together with the repair manager, for which a technical repair report is drawn up, which is signed by representatives of both parties.
3. Acceptance of the circuit breaker for repair
3.1. Before the start of a major overhaul, a commission of representatives of the operational and repair departments, with the obligatory participation of the repair manager, checks the state of readiness for repair:
a) availability of a statement of scope of work overhaul;
b) availability of materials, spare parts, special equipment and tools;
c) the state of safety measures, labor protection and fire safety;
d) availability of a capital repair schedule.
3.2. When accepting the circuit breaker for repair, it is necessary to familiarize yourself with the list of defects and the scope of work performed during the previous major overhaul and during the period between repairs.
Technical data of the oil switch MKP-35-1000-25
(meet the requirements of GOST 687 -70)
Voltage, kB:
nominal 35
highest working 40.5
Rated current, A 1000
Limit through current, kA:
effective value of periodic component 25
amplitude 63
Limit thermal stability current, kA 25
Rated shutdown current, kA 25
Shutdown power, MV-A 1750
Thermal stability current flow time, s 4
Permissible number of short circuit trips without circuit breaker inspection 5
Weight, kg:
switch with drive (without oil) 2750/2830
drive 310
transformer oil 800
Technical data of the electromagnetic drive PE-31
(meets the requirements of GOST 688-67)
Nominal voltage of the electromagnet, V:
including 110/220
disconnecting 110/220
Limits of operational operation of the drive in terms of voltage at the terminals of its windings, % of the nominal:
closing electromagnet 85 - 110
disconnecting electromagnet 65 - 120
Current consumption of the electromagnet winding at an ambient temperature of 20 °C, A:
including 248/124
disconnecting 10/5
Current consumption of the contactor switching winding at a voltage of 110/220 V, A 2/1
Resistance of electromagnet windings, Ohm:
including (one section) 0.85 - 0.92
disconnecting (one section) 20.25 - 23.75
4. Disassembling the switch
4.1. General instructions by defecation switch
4.1.1. Inspect the switch, make sure there are no oil leaks. If there is a leak, determine the cause.
4.1.2. Check that the switch frame is installed correctly and that its upper base is horizontal.
4.1.3. Inspect the fastening of the frame to the foundation ( anchor bolts must have locknuts). The frame must be reliably grounded with a steel strip with a cross-section of at least 25
´ 4 mm.4.1.4. Check the condition of the winch and cable.
4.1.5. Make sure the safety valve rupture screw is intact.
4.1.6. Carry out several test switches on and off; determine the preliminary scope of repairs.
4.2.1. Disconnect the tires.
4.2.2. Unscrew the locking screws 2 (Fig.), unscrew the nuts 1 and the cap with tip 3.
4.2.3. Unscrew the locking screw II from nut 10, remove gasket (brass washer) 4, centering washer 5 and gasket 6.
4.2.6. Install casing 7, screw on the nuts.
4.2.7. Install rubber gasket 6, centering washer 5, gasket (brass washer) 4, screw in nut 10, screw in locking screw 11.
4.2.8. Screw on the cap with tip 3, nuts 1 and screw in locking screws 2.
4.3. General operational disassembly of the circuit breaker
4.3.1. Drain the oil from the switch tanks into a previously prepared container. Check the operation of the oil indicators.
4.3.2. Turn off the oil heating device in the tanks.
4.3.3. Place the cable on the rollers 3 of the tank (Fig.), and pull it lightly. Unscrew the nuts from the bolts securing the tank, remove the washers, lower tank 1 until the cable is completely loosened, remove the cable from the tank rollers. The tanks of the other two phases are lowered similarly.
4.3.4. Unscrew the bolts securing the screen 1 (Fig.), lower the screen until it stops against the traverse.
4.3.5. Unscrew the bolts securing the housing 2 to the holder 3, lower the housing with the camera.
4.3.6. Lift the screen and place it on the bottom of the bakelite bushing. Take out the body and camera, then remove the screen.
4.3.7. Disconnect the outer and inner ends connected to current transformer 2 (see figure). Check for markings first. If not available, apply.
4.3.8. Unscrew the nuts and remove the current transformers.
Note. Only remove current transformers when they need to be replaced or dried.
4.3.9. Unscrew the nuts from the input bolts, remove the input and gasket (dismantle the input only if necessary).
5. Preparation for defect detection and repair
5.1. Thoroughly clean the components and parts from dirt, old lubricant residues and corrosion-mechanical wear products, rinse in B-70 gasoline and dry for inspection and identification of defects.
5.2. Remove traces of corrosion, varnish, and paint with sandpaper, cleaning these areas to a metallic shine.
6. Technical requirements for defect detection and repair of circuit breaker parts and assemblies
6.1. Bolts, studs, nuts, threaded connections subject to rejection if there are:
a) cracks;
b) dents, nicks, chipping of more than two turns;
c) bent bolt (stud) more than 1 mm per 100 mm of length.
6.1.1. Edges and corners on bolt heads and nuts should not be crushed or cut off. If the edges are worn more than 0.5 mm (from the nominal size), the bolt or nut is rejected.
6.1.2. Holes for cotter pins in bolts and studs should not be clogged and should be noticeably enlarged.
6.1.3. When disassembling, serviceable studs should not be removed from parts. A tight and tight fit of the studs is checked by tapping. If a rattling sound is heard, the pin should be unscrewed and the fit restored.
6.2. Shafts, axles.
6.2.1. Axles must be replaced if:
a) wear in diameter, ovality in places of wear;
b) axial curvature of more than 0.2 - 0.3 mm;
c) cracks, scuffs on the friction surfaces of shafts and axles;
d) saddles on the working friction surfaces of shafts and axles.
6.2.2. Shafts and axles should be straightened in a cold state with light blows of a hammer on a stable support. To prevent damage to parts, place wooden or lead spacers on the support and under the hammer. Check the curvature using a plumb line.
6.2.3. It is allowed to reduce the shaft, axle and ellipse of the part at the wear site by no more than 0.4 mm; check the diameter and ellipse of the shafts and axes with a micrometer.
6.2.4. It is allowed to increase the diameter of the holes and their ellipse by no more than 0.4 mm. Check the diameter and ellipse of the hole with a caliper.
6.2.5. Remove burrs on the surfaces of the axles carefully with a fine file or sandpaper.
6.2.6. Saddles and dents on the working surfaces of the axles are determined by measuring the smallest diameter in deformed areas. Filing of saddles and dents on working surfaces is not allowed.
6.3. Lock washers and spring washers must be discarded:
a) in the presence of cracks and fractures;
b) with loss of elasticity;
c) if the spread of the spring washers is less than one and a half of its thickness.
6.3.1. The normal spread of the washer is equal to twice its thickness, the acceptable one is one and a half.
6.3.2. If the fit is loosened or the alignment pins are worn, expand the hole under them and install repair size pins.
6.4. Cylindrical coil springs are subject to rejection if:
a) cracks and breaks;
b) uneven pitch of coils along the entire length of the spring of more than 10%;
c) deviations of the spring axis from the perpendicular to the end plane of more than 5 mm per 100 mm of length;
d) loss of spring elasticity is allowed within 5 - 10% of the normal value.
6.5. Seals.
6.5.1. Self-clamping oil seals are subject to rejection if:
a) dents, deep scratches and other mechanical damage to the body and cover;
b) cracks, cuts, tears, deep scratches on the surface of the cuff in contact with the shaft;
c) loose fit of the oil seal seal in the housing;
d) breakage or damage to the spring.
6.5.2. All felt seals and seals must be replaced during major repairs.
6.6. Sealing gaskets.
6.6.1. Cardboard gaskets should not have any torn spots or tears.
6.6.2. The uneven thickness of the gasket should not exceed 0.1 mm along the entire length.
6.6.3. The surface of the gasket must be smooth, clean, without folds or wrinkles.
6.6.4. Rubber gaskets should not have cracks, shear, or residual deformation. If the listed defects are present or the gasket loses elasticity, replace it.
6.7. Current transformers
6.7.1. Measure the insulation resistance of the secondary winding with a megohmmeter for a voltage of 1000 V. Insulation resistance of the secondary winding with connected secondary circuits must be at least 1 MOhm.
6.7.2. Check the condition of insulation surfaces. Wrap the damaged areas with keeper tape, varnish with bakelite varnish, and dry.
6.8.1. Movable contact
Quantity per product - 3.
|
Position in the picture |
Possible defect |
Method for eliminating the defect |
|
|
Burning, melting. Melting more than permissible (to a depth of more than 2 mm) |
File, clean Replace |
||
|
Thread damage |
Restore with thread cutting tool |
||
|
Inspection. Magnifying glass LP-1-7* |
Replace |
1. Cracks and deformation are not allowed.
3. After filing, indentations of no more than 0.5 mm are allowed.
6.8.2. Capacitor input (Fig.)
Quantity per product - 6.
|
Position in the picture |
Possible defect |
Method for identifying a defect and control tool |
Method for eliminating the defect |
|
Cracks, chips with a total area of more than 10 cm2 |
Inspection. Measurement. Ruler |
Replace |
|
|
The same area up to 10 cm 2 |
Inspection. Measurement. Ruler |
Clean, degrease, coat with a layer of bakelite varnish |
|
|
Oxidation, carbon deposits |
Clear |
||
|
Partial chipping of the putty of reinforcement joints |
Finish with subsequent varnish coating |
||
|
Cracks, peeling of mastic from the walls |
Replace |
Technical requirements to the repaired part
1. The insulation resistance must be at least 1000 MOhm.
2. Dielectric loss tangenttg dshould be no more than 3% (at a temperature of 20± 5 °C).
3. The bushing must withstand the high voltage test of 95 kV for 5 minutes.
4. Ohmic input resistance is no more than 60 μOhm.
6.8.3. Arc chamber (Fig.)
Quantity per product - 6.
|
Position in the picture |
Possible defect |
Defect identification method and control tool |
Method for eliminating the defect |
|
Burning, melting and shells |
File down, maintaining the original shape. Sinkholes on the contact surface with a depth of no more than 0.5 mm are allowed. Restore silver coating using electric spark method |
||
|
Warping and burning of insulating plates |
Replace |
||
|
Burnout of more than 2/3 of the compound layer |
Replace |
||
|
More than 1/4 of the thickness of the flexible connection package is broken |
Replace |
Technical requirements for the repaired part
1. Cracks and deformations are not allowed.
2. Breaking the thread on more than one turn is not allowed.
3. Cut off torn sheets with a break less than 1/4 of the thickness.
Quantity per product - 3.
|
Position in the picture |
Possible defect |
Defect identification method and control tool |
Method for eliminating the defect |
|
Oil indicator leaking |
Replace the defective part, clean the oil indicator glass |
||
|
Significant warping of in-tank insulation |
Inspecting a tank that is not filled with oil |
Replace |
|
|
Eliminate by editing |
|||
|
Cracks in welds |
Inspecting the oil-filled tank |
Eliminate with tea leaves |
|
|
Damage to anti-corrosion coating |
Clean damaged areas, degrease, restore coating |
||
|
Oil drain valve leaking |
Coat with putty and paint with oil paint |
Technical requirements for the repaired part
Cracks and deformations are not allowed.
7. Assembling the circuit breaker components
7.1. Installation of entries
7.1.1. Place the gasket on the cover hole under the input flange, lift the input onto the switch, carefully install it into the cover hole, center until the axes of the mounting holes coincide. Finally adjust the input position. Secure the inlet to the cover with bolts and nuts and washers. To avoid transfer, tighten the nuts alternately diagonally.
7.2. Assembly of arc extinguishing device and contact system
7.2.1. Attach flexible connections 4 to holder 3 (see Fig.) and fixed contact 6. Make sure that the ends of the bolts securing the flexible connections do not go inside the annular recess of the cup in which spring 5 is located.
7.2.2. Install spring 5, screw in the guide bolt. Make sure that the cuts of the bolt head are located opposite the holes in the wall of the brass glass.
7.2.3. Install housing 2, secure with bolts to holder 3.
7.2.4. Assemble a set of insulating plates 7, secure them to the body with 2 insulated bolts.
7.2.5. Lift the screen and place it on the bottom of the bakelite bushing.
7.2.6. Install the camera onto the current-carrying input rod and secure it using pads and bolts.
7.2.7. Check the camera installation dimensions:
Deviation from vertical ± 1 mm per full height cameras;
The distance from the camera to the axis of the guide pipe is within 90 ± 1 mm.
In this case, the moving contacts must move in the chamber without touching its walls.
Adjustment is made by changing the position of the camera on the current-carrying rod.
7.2.8. Fix the position of the camera on the current-carrying input rod with a locking screw.
7.2.9. Place screen 1 on the camera and secure it with bolts.
8. Switch adjustment
8.1. Check the operation of the drive mechanism. Turn on the switch slowly using a DV-33 jack. At the same time, check whether there are areas where the moving system is stuck and an increase in the muscular effort required to turn on is felt. During the switching process (during the entire stroke), loosen the force on the jack handle several times, creating the possibility of reverse motion of the moving system.
Check whether the moving system of the switch will stop (freeze) in any intermediate position.
8.2. Check the correct position of the drive mechanism levers using a template (Fig.).
At correct position The levers of the drive mechanism axis must touch the template. An undershoot of the middle axis relative to the template line by 2 - 3 mm is allowed.
Attention! The transition of the middle axis beyond the template line towards the thrust pin is not allowed.
8.3. Non-compliance with the axle position pattern can be adjusted by shortening or lengthening the rods between the drive mechanisms of different phases by screwing in their tips.
If there is an equal discrepancy between the pattern of all three phases, adjustment should be made by changing the length of the vertical rod going to the drive.
8.4. Check the gap (1.5 - 2 mm) between the drive mechanism lever and the thrust pin.
Adjust the position of the stop pin in the on position of the switch.
8.5. Check full speed moving contact.
With the switch in the “on” position, make a mark on the rod at the lower end of the guide pipe. Turn off the switch and mark the rod again.
The full stroke of the rod is 270 - 280 mm.
8.6. Check the simultaneous closure of the pole contacts (discrepancy of no more than 2 mm is allowed), the closure of contacts between poles (divergence of no more than 4 mm).
Adjust:
a) lowering or raising cameras with fixed contacts;
b) screwing or unscrewing the movable contacts (rods) in the traverse liners.
8.7. Measure the contact resistance of each pole (no more than 300 μOhm). Measure with the secondary winding of the current transformers closed to the operating load or short-circuited.
8.8. Take a vibration record, check the speed of movement of the moving contacts of the switch (without oil) when turning it off and on:
at the moment of contact opening - 1.7 - 2.3 m/s and 1.8 - 2.6 m/s; maximum - 3.0 - 3.6 m/s and 2.1 - 5.9 m/s, respectively.
Checking simultaneity, stroke in contacts (pressing - 16± 1 mm), it is recommended to take speed and time characteristics using a remote control (Fig. ).
9. Drive repair
9.1. Drive Inspection
9.1.1. Clean and inspect all accessible parts of the drive from dust, dirt and old grease, check:
a) the condition of the axles and springs;
b) drive mount;
c) degree of corrosion of parts;
d) absence of dents and hardening on working surfaces.
Carry out defect detection and repair of drive parts in accordance with Section. .
9.1.2. Check for distortion and jamming of the electromagnet cores.
9.1.3. Pay attention to the reliability of the connections and their fastening.
9.1.4. Pay special attention to the presence in all links of the transmission mechanisms of devices that prevent spontaneous unscrewing (lock nuts, spring washers, etc.).
9.1.5. Inspect the block contacts KBO and KKB. Pay attention to the condition of the moving and fixed contacts, springs, clamps, contact screws, rods and levers.
9.1.6. Specify the final scope of drive repair. Disassemble the drive only if faults are detected that interfere with further normal operation of the drive.
9.2. Drive regulation
Attention! To avoid injury in the event of accidental shutdown during drive adjustment, it is necessary to screw the safety bolt 6 (Fig. ) all the way to the shutdown pawl 5. When shutting down or completing the adjustment, unscrew bolt 6, setting the gap to 13 - 15 mm.
9.2.1. Maintain gaps and recesses of pawls in accordance with Fig. . Adjust the drop value of 5 - 8 mm of the disconnecting pawl 5 with bolt 2 and screw 4.
9.2.2. Check the reliability of engagement of lever 3 with the latch when the release pawl 5 rests against bolt 6. Adjust with bolt 1.
9.2.3. Check that the position of the KBB and KBO contacts corresponds to the position of the switch. The on position of the switch must correspond to the off position of the KBB contact and the on position of the KBO contact.
9.2.4. Check the opening of the KBV block contacts at the end of the drive activation stroke. The test is carried out at a minimum voltage (93.5/187 V) at the terminals of the switching electromagnet at the moment of switching on.
9.2.5. Adjust the gap between the pawls and ratchets at the block contacts in accordance with Fig. . The adjustment is made by moving the fork 4 (Fig. ) along the rod 3 and moving the threaded pin 2. The fork 4 must rotate on the rod 3.
Attention! To avoid damage to the transmission links of the block contacts, be careful when adjusting and attach the rod to the levers only after first checking its length in both extreme positions of the drive.
9.2.6. Coat the core of the switching electromagnet with a special lubricant (one part CIATIM-203 and one part amorphous or silver graphite).
10. Final assembly and testing of the circuit breaker
10.1. Clean the tank from dirt, wipe it, check the serviceability of the internal insulation.
10.2. Check the serviceability of the oil drain valves and electric heating. Turn on the tubular heaters at a voltage equal to 50% of the nominal voltage for 2 hours - for drying.
10.3. Install a removable winch, put the winch cable on the tank rollers 3 (see fig.) and use the winch to lift the tanks and secure them.
10.4. Measure the shaft rotation angle, which should be 57°.
10.5. Fill the tanks with oil, the breakdown voltage of which is not lower than 35 kV. When filling, check the operation of the oil indicators and check for leaks. After filling and settling the oil, take a sample. The breakdown voltage of the oil must be at least 30 kV.
10.6. Paint the switch.
10.7. Connect tire deflations.
10.8. Determine the minimum voltage of the closing electromagnet at which the drive is able to turn on the switch without load.
10.9. Determine the lowest voltage of the tripping electromagnet at which the drive is able to trip the circuit breaker.
10.10. Check the joint operation of the switch with the drive by turning the switch on and off five times.
10.11. Before commissioning, test the switch with a voltage of 95 kV for 1 minute.
Appendix 1
List of tools required for overhaul of the circuit breaker
|
Name |
Designation |
Standard designation |
Quantity, pcs. |
|
|
1. Open-end wrenches, double-sided: |
||||
|
S = 8´ 10 mm |
Key 7811-0003 |
|||
|
S = 12´ 14 mm |
Key 7811-0021 |
|||
|
S = 14´ 17 mm |
Key 7811-0022 |
|||
|
S = 17´ 19 mm |
Key 7811-0023 |
|||
|
S = 22´ 24 mm |
Key 7811-0025 |
|||
|
2. Open-end wrenches, single-sided: |
||||
|
Key 7811-0142 |
||||
|
Key 7811-0146 |
||||
|
3. Pipe lever wrench No. 1 |
||||
|
4. Combination pliers, 200 mm long |
Pliers, 200 |
|||
|
5. Flat, blunt-nosed file |
File 2820-0029 |
|||
|
File 2820-0029 |
||||
|
6. Screwdriver for mechanics |
Screwdriver 7810-0309 |
|||
|
7. Bench hammer, steel, weighing 400 g |
Hammer 7850-0034 |
|||
|
8. Metric measuring ruler |
Line 1-500 |
|||
|
Line 1-150 |
||||
|
9. Vernier caliper |
||||
|
10. Bar level |
Level 150 mm long |
|||
|
13. Manual jack |
||||
|
14. Device for taking vibrograms |
||||
|
15. Template |
||||
|
16. Electric drill |
||||
|
17. Drills with a diameter of 6; 8 mm |
||||
|
18. Taps |
||||
Appendix 2
List of devices used during repairs
|
Name and designation |
Purpose and brief description |
|
1. Portable bridge - MD-16 |
Device for measuring capacitance and dielectric loss angle tgd |
|
2. Megaohmmeter M-1101 |
1000 V insulation resistance measurement |
|
3. Microohmmeter M-246 |
Measuring contact resistance |
|
4. Vibrograph |
Vibrogram removal, 12 V |
|
5. Voltmeter E-L5 |
0-600 V, class 0.5 |
|
6. Switch adjustment panel. Development of the Yuzhenergoremont enterprise |
Checking the simultaneous closure of contacts of a pole and between poles, taking characteristics, power supply of a vibrograph, lighting |
|
7. Installation for silvering by electrospark method EFI-54 |
Restoration of silver-plated contact surfaces (in the workshop only). The thickness of the applied layer is 0.01 mm. Maximum productivity up to 10 cm 2 /min |
|
8. Folding pocket magnifying glass LP-1-7* |
|
|
9. RSPS dual resistor |
340 ohms ± 10% 1 A - in series 2 A - parallel |
Appendix 3
Standards for material consumption for major repairs of a circuit breaker
|
Name |
Standard designation |
Consumption rate for repairing one circuit breaker |
|
Transformer oil TKp, kg |
||
|
Grease CIATIM-203, kg |
||
|
Aviation gasoline B-70, l |
||
|
Wiping rags, kg |
||
|
Sanding paper, different, m 2 |
||
|
Paint yellow, red, green, gray, kg |
As needed |
|
|
Electrical insulating cardboard EM, 1 mm thick, kg |
||
|
Technical sheet rubber, kg: |
||
MINISTRY OF ENERGY AND ELECTRIFICATION OF THE USSR
GLAVENERGOREMONT
MANAGEMENT
FOR OVERHAUL REPAIRS
OIL SWITCH
MKP-35-1000-25
RD 34.47.604
SERVICE OF EXCELLENCE FOR SOYUZTEKHENERGO
Moscow 1986
AGREED: I CONFIRM:
Deputy Director
for scientific work
Research Institute of Software Chief Engineer
"Uralelektrotyazhmash" Glavenergoremont
A.I. Utkin V.I. KURKOVICH
1. Introduction
1.1. The manual for the overhaul of the oil switch MKP-35-1000-25* is a technical document, compliance with the requirements of which is mandatory for personnel performing overhaul of the switch.
*Hereinafter referred to as the Guide for brevity.
1.2. The manual provides for the use of the most rational forms of organizing repair work and advanced technological methods for their implementation.
1.3. The Guide contains:
a) technical requirements for the volume and quality of repair work and for the methods of their implementation (regardless of the organizational and technical level of repair departments);
b) method of control during the repair of parts and assembly units;
c) rules for accepting equipment for repair and repair;
d) criteria for assessing the quality of repair work.
1.4. The manual was developed based on the technical documentation of the manufacturer.
2. Organization of work to repair the circuit breaker
2.1. General provisions
2.1.1. The composition of the team (link) for repairing the circuit breaker is established depending on the intended scope of work (the duration of repair work is determined by the network repair schedule).
2.1.2. The timing of repair work should be determined taking into account the following:
a) the composition of the team must correspond to the technological repair scheme. Changing the composition of the team until the repair is completed is not allowed;
c) to ensure the completion of repair work within the established time frame, it is recommended to issue standardized task plans and use the aggregate-unit method of repair using the exchange stock of parts;
d) the work schedule of repair personnel should be subject to the maximum reduction in the duration of repair work.
2.1.3. The manual provides for a repair team of 4 people: electricians of the 5th category - 1 person, 3rd category - 2 people, 2nd category - 1 person.
2.1.4. Labor costs for overhaul of the circuit breaker are determined on the basis of the “Time standards for overhaul, current repairs and operational maintenance of equipment for substations 35 - 500 kV and distribution networks 0.4 - 20 kV” approved by the USSR Ministry of Energy in 1971.
Standards for overhaul of oil switch MKP-35-1000-25 (without changing inputs) - 41.8 man-hours, with changing inputs - 52 man-hours.
2.2. Preparation for repair
2.2.1. Preparation for major repairs is carried out in accordance with the specific scope of work provided for this type of equipment.
2.2.2. Before the start of repairs, a team of workers with appropriate qualifications who have undergone training, knowledge testing and instructions on the rules of safe work is staffed.
2.2.3. Before starting work, the team is given a planned task with a specific list of work and an indication of its volume, labor costs and completion date, as well as technological instructions and requirements.
2.2.4. Before starting repairs you must:
a) prepare a set of plumbing tools, as well as instruments and measuring tools (applications,);
b) prepare basic and auxiliary materials, spare parts for repairs (applications,); The list and quantity of materials should be specified in accordance with the scope of work;
c) prepare and check protective equipment;
d) coordinate the work procedure with other teams performing related work.
2.2.5. The performers, together with the repair manager, after drawing up a general work order for the repair of the circuit breaker, must:
a) make sure that all measures to ensure the safety of work are carried out correctly and completely;
b) carry out all fire safety measures.
2.3. Quality control of repair work
2.3.1. Quality control of repair work by the contractor is carried out in the following order:
a) check, together with the repair manager, the condition of each assembly unit during the repair. In this case, the manager must give instructions on repair methods and supplement (clarify) the technical requirements for repairs, according to which the assembly unit will be accepted from repair and the quality of repair work will be assessed;
b) present completed hidden work and completed intermediate operations to the manager for acceptance and quality assessment;
c) after completing all repair work, present the circuit breaker for final acceptance.
2.3.2. The final acceptance of the product as a whole is carried out by representatives of the operational department together with the repair manager, for which a technical repair report is drawn up, which is signed by representatives of both parties.
3. Acceptance of the circuit breaker for repair
3.1. Before the start of a major overhaul, a commission of representatives of the operational and repair departments, with the obligatory participation of the repair manager, checks the state of readiness for repair:
a) availability of a statement of the volume of capital repair work;
b) availability of materials, spare parts, special equipment and tools;
c) the state of safety measures, labor protection and fire safety;
d) availability of a capital repair schedule.
3.2. When accepting the circuit breaker for repair, it is necessary to familiarize yourself with the list of defects and the scope of work performed during the previous major overhaul and during the period between repairs.
Technical data of the oil switch MKP-35-1000-25
(meet the requirements of GOST 687 -70)
Voltage, kB:
nominal 35
highest working 40.5
Rated current, A 1000
Limit through current, kA:
effective value of periodic component 25
amplitude 63
Limit thermal stability current, kA 25
Rated shutdown current, kA 25
Shutdown power, MV-A 1750
Thermal stability current flow time, s 4
Permissible number of short circuit trips without circuit breaker inspection 5
Weight, kg:
switch with drive (without oil) 2750/2830
drive 310
transformer oil 800
Technical data of the electromagnetic drive PE-31
(meets the requirements of GOST 688-67)
Nominal voltage of the electromagnet, V:
including 110/220
disconnecting 110/220
Limits of operational operation of the drive in terms of voltage at the terminals of its windings, % of the nominal:
closing electromagnet 85 - 110
disconnecting electromagnet 65 - 120
Current consumption of the electromagnet winding at an ambient temperature of 20 °C, A:
including 248/124
disconnecting 10/5
Current consumption of the contactor switching winding at a voltage of 110/220 V, A 2/1
Resistance of electromagnet windings, Ohm:
including (one section) 0.85 - 0.92
disconnecting (one section) 20.25 - 23.75
4. Disassembling the switch
4.1. General instructions for defecating the circuit breaker
4.1.1. Inspect the switch, make sure there are no oil leaks. If there is a leak, determine the cause.
4.1.2. Check that the switch frame is installed correctly and that its upper base is horizontal.
4.1.3. Inspect the fastening of the frame to the foundation (anchor bolts must have locknuts). The frame must be reliably grounded with a steel strip with a cross-section of at least 25
´ 4 mm.4.1.4. Check the condition of the winch and cable.
4.1.5. Make sure the safety valve rupture screw is intact.
4.1.6. Carry out several test switches on and off; determine the preliminary scope of repairs.
4.2.1. Disconnect the tires.
4.2.2. Unscrew the locking screws 2 (Fig.), unscrew the nuts 1 and the cap with tip 3.
4.2.3. Unscrew the locking screw II from nut 10, remove gasket (brass washer) 4, centering washer 5 and gasket 6.
4.2.6. Install casing 7, screw on the nuts.
4.2.7. Install rubber gasket 6, centering washer 5, gasket (brass washer) 4, screw in nut 10, screw in locking screw 11.
4.2.8. Screw on the cap with tip 3, nuts 1 and screw in locking screws 2.
4.3. General operational disassembly of the circuit breaker
4.3.1. Drain the oil from the switch tanks into a previously prepared container. Check the operation of the oil indicators.
4.3.2. Turn off the oil heating device in the tanks.
4.3.3. Place the cable on the rollers 3 of the tank (Fig.), and pull it lightly. Unscrew the nuts from the bolts securing the tank, remove the washers, lower tank 1 until the cable is completely loosened, remove the cable from the tank rollers. The tanks of the other two phases are lowered similarly.
4.3.4. Unscrew the bolts securing the screen 1 (Fig.), lower the screen until it stops against the traverse.
4.3.5. Unscrew the bolts securing the housing 2 to the holder 3, lower the housing with the camera.
4.3.6. Lift the screen and place it on the bottom of the bakelite bushing. Take out the body and camera, then remove the screen.
4.3.7. Disconnect the outer and inner ends connected to current transformer 2 (see figure). Check for markings first. If not available, apply.
4.3.8. Unscrew the nuts and remove the current transformers.
Note. Only remove current transformers when they need to be replaced or dried.
4.3.9. Unscrew the nuts from the input bolts, remove the input and gasket (dismantle the input only if necessary).
5. Preparation for defect detection and repair
5.1. Thoroughly clean the components and parts from dirt, old lubricant residues and corrosion-mechanical wear products, rinse in B-70 gasoline and dry for inspection and identification of defects.
5.2. Remove traces of corrosion, varnish, and paint with sandpaper, cleaning these areas to a metallic shine.
6. Technical requirements for defect detection and repair of circuit breaker parts and assemblies
6.1. Bolts, studs, nuts, threaded connections are subject to rejection if:
a) cracks;
b) dents, nicks, chipping of more than two turns;
c) bent bolt (stud) more than 1 mm per 100 mm of length.
6.1.1. Edges and corners on bolt heads and nuts should not be crushed or cut off. If the edges are worn more than 0.5 mm (from the nominal size), the bolt or nut is rejected.
6.1.2. Holes for cotter pins in bolts and studs should not be clogged and should be noticeably enlarged.
6.1.3. When disassembling, serviceable studs should not be removed from parts. A tight and tight fit of the studs is checked by tapping. If a rattling sound is heard, the pin should be unscrewed and the fit restored.
6.2. Shafts, axles.
6.2.1. Axles must be replaced if:
a) wear in diameter, ovality in places of wear;
b) axial curvature of more than 0.2 - 0.3 mm;
c) cracks, scuffs on the friction surfaces of shafts and axles;
d) saddles on the working friction surfaces of shafts and axles.
6.2.2. Shafts and axles should be straightened in a cold state with light blows of a hammer on a stable support. To prevent damage to parts, place wooden or lead spacers on the support and under the hammer. Check the curvature using a plumb line.
6.2.3. It is allowed to reduce the shaft, axle and ellipse of the part at the wear site by no more than 0.4 mm; check the diameter and ellipse of the shafts and axes with a micrometer.
6.2.4. It is allowed to increase the diameter of the holes and their ellipse by no more than 0.4 mm. Check the diameter and ellipse of the hole with a caliper.
6.2.5. Remove burrs on the surfaces of the axles carefully with a fine file or sandpaper.
6.2.6. Saddles and dents on the working surfaces of the axles are determined by measuring the smallest diameter in deformed areas. Filing of saddles and dents on working surfaces is not allowed.
6.3. Lock washers and spring washers must be discarded:
a) in the presence of cracks and fractures;
b) with loss of elasticity;
c) if the spread of the spring washers is less than one and a half of its thickness.
6.3.1. The normal spread of the washer is equal to twice its thickness, the acceptable one is one and a half.
6.3.2. If the fit is loosened or the alignment pins are worn, expand the hole under them and install repair size pins.
6.4. Cylindrical coil springs are subject to rejection if:
a) cracks and breaks;
b) uneven pitch of coils along the entire length of the spring of more than 10%;
c) deviations of the spring axis from the perpendicular to the end plane of more than 5 mm per 100 mm of length;
d) loss of spring elasticity is allowed within 5 - 10% of the normal value.
6.5. Seals.
6.5.1. Self-clamping oil seals are subject to rejection if:
a) dents, deep scratches and other mechanical damage to the body and cover;
b) cracks, cuts, tears, deep scratches on the surface of the cuff in contact with the shaft;
c) loose fit of the oil seal seal in the housing;
d) breakage or damage to the spring.
6.5.2. All felt seals and seals must be replaced during major repairs.
6.6. Sealing gaskets.
6.6.1. Cardboard gaskets should not have any torn spots or tears.
6.6.2. The uneven thickness of the gasket should not exceed 0.1 mm along the entire length.
6.6.3. The surface of the gasket must be smooth, clean, without folds or wrinkles.
6.6.4. Rubber gaskets should not have cracks, shear, or residual deformation. If the listed defects are present or the gasket loses elasticity, replace it.
6.7. Current transformers
6.7.1. Measure the insulation resistance of the secondary winding with a megohmmeter for a voltage of 1000 V. The insulation resistance of the secondary winding with connected secondary circuits must be at least 1 MOhm.
6.7.2. Check the condition of insulation surfaces. Wrap the damaged areas with keeper tape, varnish with bakelite varnish, and dry.
6.8.1. Movable contact
Quantity per product - 3.
|
Position in the picture |
Possible defect |
Method for eliminating the defect |
|
|
Burning, melting. Melting more than permissible (to a depth of more than 2 mm) |
File, clean Replace |
||
|
Thread damage |
Restore with thread cutting tool |
||
|
Inspection. Magnifying glass LP-1-7* |
Replace |
1. Cracks and deformation are not allowed.
3. After filing, indentations of no more than 0.5 mm are allowed.
6.8.2. Capacitor input (Fig.)
Quantity per product - 6.
|
Position in the picture |
Possible defect |
Defect identification method and control tool |
Method for eliminating the defect |
|
Cracks, chips with a total area of more than 10 cm2 |
Inspection. Measurement. Ruler |
Replace |
|
|
The same area up to 10 cm 2 |
Inspection. Measurement. Ruler |
Clean, degrease, coat with a layer of bakelite varnish |
|
|
Oxidation, carbon deposits |
Clear |
||
|
Partial chipping of the putty of reinforcement joints |
Finish with subsequent varnish coating |
||
|
Cracks, peeling of mastic from the walls |
Replace |
Technical requirements for the repaired part
1. The insulation resistance must be at least 1000 MOhm.
2. Dielectric loss tangenttg dshould be no more than 3% (at a temperature of 20± 5 °C).
3. The bushing must withstand the high voltage test of 95 kV for 5 minutes.
4. Ohmic input resistance is no more than 60 μOhm.
6.8.3. Arc chamber (Fig.)
Quantity per product - 6.
|
Position in the picture |
Possible defect |
Defect identification method and control tool |
Method for eliminating the defect |
|
Burning, melting and shells |
File down, maintaining the original shape. Sinkholes on the contact surface with a depth of no more than 0.5 mm are allowed. Restore silver coating using electric spark method |
||
|
Warping and burning of insulating plates |
Replace |
||
|
Burnout of more than 2/3 of the compound layer |
Replace |
||
|
More than 1/4 of the thickness of the flexible connection package is broken |
Replace |
Technical requirements for the repaired part
1. Cracks and deformations are not allowed.
2. Breaking the thread on more than one turn is not allowed.
3. Cut off torn sheets with a break less than 1/4 of the thickness.
Quantity per product - 3.
|
Position in the picture |
Possible defect |
Defect identification method and control tool |
Method for eliminating the defect |
|
Oil indicator leaking |
Replace the defective part, clean the oil indicator glass |
||
|
Significant warping of in-tank insulation |
Inspecting a tank that is not filled with oil |
Replace |
|
|
Eliminate by editing |
|||
|
Cracks in welds |
Inspecting the oil-filled tank |
Eliminate with tea leaves |
|
|
Damage to anti-corrosion coating |
Clean damaged areas, degrease, restore coating |
||
|
Oil drain valve leaking |
Coat with putty and paint with oil paint |
Technical requirements for the repaired part
Cracks and deformations are not allowed.
7. Assembling the circuit breaker components
7.1. Installation of entries
7.1.1. Place the gasket on the cover hole under the input flange, lift the input onto the switch, carefully install it into the cover hole, center until the axes of the mounting holes coincide. Finally adjust the input position. Secure the inlet to the cover with bolts and nuts and washers. To avoid transfer, tighten the nuts alternately diagonally.
7.2. Assembly of arc extinguishing device and contact system
7.2.1. Attach flexible connections 4 to holder 3 (see Fig.) and fixed contact 6. Make sure that the ends of the bolts securing the flexible connections do not go inside the annular recess of the cup in which spring 5 is located.
7.2.2. Install spring 5, screw in the guide bolt. Make sure that the cuts of the bolt head are located opposite the holes in the wall of the brass glass.
7.2.3. Install housing 2, secure with bolts to holder 3.
7.2.4. Assemble a set of insulating plates 7, secure them to the body with 2 insulated bolts.
7.2.5. Lift the screen and place it on the bottom of the bakelite bushing.
7.2.6. Install the camera onto the current-carrying input rod and secure it using pads and bolts.
7.2.7. Check the camera installation dimensions:
Deviation from the vertical ± 1 mm at the full height of the camera;
The distance from the camera to the axis of the guide pipe is within 90 ± 1 mm.
In this case, the moving contacts must move in the chamber without touching its walls.
Adjustment is made by changing the position of the camera on the current-carrying rod.
7.2.8. Fix the position of the camera on the current-carrying input rod with a locking screw.
7.2.9. Place screen 1 on the camera and secure it with bolts.
8. Switch adjustment
8.1. Check the operation of the drive mechanism. Turn on the switch slowly using a DV-33 jack. At the same time, check whether there are areas where the moving system is stuck and an increase in the muscular effort required to turn on is felt. During the switching process (during the entire stroke), loosen the force on the jack handle several times, creating the possibility of reverse motion of the moving system.
Check whether the moving system of the switch will stop (freeze) in any intermediate position.
8.2. Check the correct position of the drive mechanism levers using a template (Fig.).
When the levers are in the correct position, the axles of the drive mechanism should touch the template. An undershoot of the middle axis relative to the template line by 2 - 3 mm is allowed.
Attention! The transition of the middle axis beyond the template line towards the thrust pin is not allowed.
8.3. Non-compliance with the axle position pattern can be adjusted by shortening or lengthening the rods between the drive mechanisms of different phases by screwing in their tips.
If there is an equal discrepancy between the pattern of all three phases, adjustment should be made by changing the length of the vertical rod going to the drive.
8.4. Check the gap (1.5 - 2 mm) between the drive mechanism lever and the thrust pin.
Adjust the position of the stop pin in the on position of the switch.
8.5. Check the full stroke of the moving contact.
With the switch in the “on” position, make a mark on the rod at the lower end of the guide pipe. Turn off the switch and mark the rod again.
The full stroke of the rod is 270 - 280 mm.
8.6. Check the simultaneous closure of the pole contacts (discrepancy of no more than 2 mm is allowed), the closure of contacts between poles (divergence of no more than 4 mm).
Adjust:
a) lowering or raising cameras with fixed contacts;
b) screwing or unscrewing the movable contacts (rods) in the traverse liners.
8.7. Measure the contact resistance of each pole (no more than 300 μOhm). Measure with the secondary winding of the current transformers closed to the operating load or short-circuited.
8.8. Take a vibration record, check the speed of movement of the moving contacts of the switch (without oil) when turning it off and on:
at the moment of contact opening - 1.7 - 2.3 m/s and 1.8 - 2.6 m/s; maximum - 3.0 - 3.6 m/s and 2.1 - 5.9 m/s, respectively.
Checking simultaneity, stroke in contacts (pressing - 16± 1 mm), it is recommended to take speed and time characteristics using a remote control (Fig. ).
9. Drive repair
9.1. Drive Inspection
9.1.1. Clean and inspect all accessible parts of the drive from dust, dirt and old grease, check:
a) the condition of the axles and springs;
b) drive mount;
c) degree of corrosion of parts;
d) absence of dents and hardening on working surfaces.
Carry out defect detection and repair of drive parts in accordance with Section. .
9.1.2. Check for distortion and jamming of the electromagnet cores.
9.1.3. Pay attention to the reliability of the connections and their fastening.
9.1.4. Pay special attention to the presence in all links of the transmission mechanisms of devices that prevent spontaneous unscrewing (lock nuts, spring washers, etc.).
9.1.5. Inspect the block contacts KBO and KKB. Pay attention to the condition of the moving and fixed contacts, springs, clamps, contact screws, rods and levers.
9.1.6. Specify the final scope of drive repair. Disassemble the drive only if faults are detected that interfere with further normal operation of the drive.
9.2. Drive regulation
Attention! To avoid injury in the event of accidental shutdown during drive adjustment, it is necessary to screw the safety bolt 6 (Fig. ) all the way to the shutdown pawl 5. When shutting down or completing the adjustment, unscrew bolt 6, setting the gap to 13 - 15 mm.
9.2.1. Maintain gaps and recesses of pawls in accordance with Fig. . Adjust the drop value of 5 - 8 mm of the disconnecting pawl 5 with bolt 2 and screw 4.
9.2.2. Check the reliability of engagement of lever 3 with the latch when the release pawl 5 rests against bolt 6. Adjust with bolt 1.
9.2.3. Check that the position of the KBB and KBO contacts corresponds to the position of the switch. The on position of the switch must correspond to the off position of the KBB contact and the on position of the KBO contact.
9.2.4. Check the opening of the KBV block contacts at the end of the drive activation stroke. The test is carried out at a minimum voltage (93.5/187 V) at the terminals of the switching electromagnet at the moment of switching on.
9.2.5. Adjust the gap between the pawls and ratchets at the block contacts in accordance with Fig. . The adjustment is made by moving the fork 4 (Fig. ) along the rod 3 and moving the threaded pin 2. The fork 4 must rotate on the rod 3.
Attention! To avoid damage to the transmission links of the block contacts, be careful when adjusting and attach the rod to the levers only after first checking its length in both extreme positions of the drive.
9.2.6. Coat the core of the switching electromagnet with a special lubricant (one part CIATIM-203 and one part amorphous or silver graphite).
10. Final assembly and testing of the circuit breaker
10.1. Clean the tank from dirt, wipe it, check the serviceability of the internal insulation.
10.2. Check the serviceability of the oil drain valves and electric heating. Turn on the tubular heaters at a voltage equal to 50% of the nominal voltage for 2 hours - for drying.
10.3. Install a removable winch, put the winch cable on the tank rollers 3 (see fig.) and use the winch to lift the tanks and secure them.
10.4. Measure the shaft rotation angle, which should be 57°.
10.5. Fill the tanks with oil, the breakdown voltage of which is not lower than 35 kV. When filling, check the operation of the oil indicators and check for leaks. After filling and settling the oil, take a sample. The breakdown voltage of the oil must be at least 30 kV.
10.6. Paint the switch.
10.7. Connect tire deflations.
10.8. Determine the minimum voltage of the closing electromagnet at which the drive is able to turn on the switch without load.
10.9. Determine the lowest voltage of the tripping electromagnet at which the drive is able to trip the circuit breaker.
10.10. Check the joint operation of the switch with the drive by turning the switch on and off five times.
10.11. Before commissioning, test the switch with a voltage of 95 kV for 1 minute.
Appendix 1
List of tools required for overhaul of the circuit breaker
|
Name |
Designation |
Standard designation |
Quantity, pcs. |
|
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1. Open-end wrenches, double-sided: |
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S = 8´ 10 mm |
Key 7811-0003 |
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S = 12´ 14 mm |
Key 7811-0021 |
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S = 14´ 17 mm |
Key 7811-0022 |
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S = 17´ 19 mm |
Key 7811-0023 |
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S = 22´ 24 mm |
Key 7811-0025 |
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2. Open-end wrenches, single-sided: |
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Key 7811-0142 |
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Key 7811-0146 |
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3. Pipe lever wrench No. 1 |
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4. Combination pliers, 200 mm long |
Pliers, 200 |
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5. Flat, blunt-nosed file |
File 2820-0029 |
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File 2820-0029 |
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6. Screwdriver for mechanics |
Screwdriver 7810-0309 |
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7. Bench hammer, steel, weighing 400 g |
Hammer 7850-0034 |
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8. Metric measuring ruler |
Line 1-500 |
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Line 1-150 |
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9. Vernier caliper |
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10. Bar level |
Level 150 mm long |
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13. Manual jack |
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14. Device for taking vibrograms |
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15. Template |
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16. Electric drill |
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17. Drills with a diameter of 6; 8 mm |
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18. Taps |
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Appendix 2
List of devices used during repairs
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Name and designation |
Purpose and brief description |
|
1. Portable bridge - MD-16 |
Device for measuring capacitance and dielectric loss angle tgd |
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2. Megaohmmeter M-1101 |
1000 V insulation resistance measurement |
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3. Microohmmeter M-246 |
Measuring contact resistance |
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4. Vibrograph |
Vibrogram removal, 12 V |
|
5. Voltmeter E-L5 |
0-600 V, class 0.5 |
|
6. Switch adjustment panel. Development of the Yuzhenergoremont enterprise |
Checking the simultaneous closure of contacts of a pole and between poles, taking characteristics, power supply of a vibrograph, lighting |
|
7. Installation for silvering by electrospark method EFI-54 |
Restoration of silver-plated contact surfaces (in the workshop only). The thickness of the applied layer is 0.01 mm. Maximum productivity up to 10 cm 2 /min |
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8. Folding pocket magnifying glass LP-1-7* |
|
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9. RSPS dual resistor |
340 ohms ± 10% 1 A - in series 2 A - parallel |
Appendix 3
Standards for material consumption for major repairs of a circuit breaker
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Name |
Standard designation |
Consumption rate for repairing one circuit breaker |
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Transformer oil TKp, kg |
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Grease CIATIM-203, kg |
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Aviation gasoline B-70, l |
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Wiping rags, kg |
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Sanding paper, different, m 2 |
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Paint yellow, red, green, gray, kg |
As needed |
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Electrical insulating cardboard EM, 1 mm thick, kg |
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Technical sheet rubber, kg: |
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-»- Spare parts kit available upon special order
Appendix 5List of main indicators of the technical condition of the circuit breaker after major repairsPower system (REU) _________________________________________________ Enterprise _________________________________________________ Statement Type ______________________ Manufacturer __________________________ Serial number _______________________ Year of manufacture ________________ Reason for repair________(scheduled, extraordinary, after shutdown_________ maximum number of short circuits)______________________________ Start of repairs ____________________________ (date) Completion of repairs _________________________ (date) 1. List of overhauls of circuit breaker assembly units (to be completed on assembly units requiring replacement or major repairs of parts) 2. Switch adjustment
3. Testing a switch with an electromagnetic drive
4. Conclusion
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MINISTRY OF ENERGY AND ELECTRIFICATION OF THE USSR
GLAVENERGOREMONT
MANAGEMENT
FOR OVERHAUL REPAIRS
OIL SWITCH
MKP-35-1000-25
RD 34.47.604
SERVICE OF EXCELLENCE FOR SOYUZTEKHENERGO
"Uralelektrotyazhmash" Glavenergoremont
A.I. Utkin V.I. KURKOVICH
1. Introduction
1.1. The manual for the overhaul of the oil switch MKP-35-1000-25* is technical document, compliance with the requirements of which is mandatory for personnel performing major repairs of the circuit breaker.
c) rules for accepting equipment for repair and repair;
d) criteria for assessing the quality of repair work.
1.4. The manual was developed based on the technical documentation of the manufacturer.
2. Organization of work to repair the circuit breaker
2.1. General provisions
2.1.1. The composition of the team (link) for repairing the circuit breaker is established depending on the intended scope of work (the duration of repair work is determined by the network repair schedule).
2.1.2. The timing of repair work should be determined taking into account the following:
a) the composition of the team must correspond to the technological repair scheme. Changing the composition of the team until the repair is completed is not allowed;
b) continuous workload of individual performers and the team as a whole is ensured;
c) to ensure the completion of repair work within the established time frame, it is recommended to issue standardized task plans and use the aggregate-unit method of repair using the exchange stock of parts;
d) the work schedule of repair personnel should be subject to the maximum reduction in the duration of repair work.
2.1.3. The manual provides for a repair team of 4 people: electricians of the 5th category - 1 person, 3rd category - 2 people, 2nd category - 1 person.
2.1.4. Labor costs for major repairs of the circuit breaker are determined on the basis of the “Time standards for major, current repairs and operational maintenance of equipment for substations 35 - 500 kV and distribution networks 0.4 - 20 kV,” approved by the USSR Ministry of Energy in 1971.
Standards for overhaul of oil switch MKP-35-1000-25 (without changing inputs) - 41.8 man-hours, with changing inputs - 52 man-hours.
2.2. Preparation for repair
2.2.1. Preparation for major repairs is carried out in accordance with the specific scope of work provided for this type of equipment.
2.2.2. Before the start of repairs, a team of workers with appropriate qualifications who have undergone training, knowledge testing and instructions on the rules of safe work is staffed.
2.2.3. Before starting work, the team is given a planned task with a specific list of work and an indication of its volume, labor costs and completion date, as well as technological instructions and requirements.
2.2.4. Before starting repairs you must:
a) prepare a set of plumbing tools, as well as instruments and measuring tools (Appendices 1, 2);
b) prepare basic and auxiliary materials, spare parts for repairs (Appendices 3, 4); The list and quantity of materials should be specified in accordance with the scope of work;
c) prepare and check protective equipment;
d) coordinate the work procedure with other teams performing related work.
2.2.5. The performers, together with the repair manager, after drawing up a general work order for the repair of the circuit breaker, must:
a) make sure that all measures to ensure the safety of work are carried out correctly and completely;
b) carry out all fire safety measures.
2.3. Quality control of repair work
2.3.1. Quality control of repair work by the contractor is carried out in the following order:
a) check, together with the repair manager, the condition of each assembly unit during the repair. In this case, the manager must give instructions on repair methods and supplement (clarify) the technical requirements for repairs, according to which the assembly unit will be accepted from repair and the quality of repair work will be assessed;
b) present completed hidden work and completed intermediate operations to the manager for acceptance and quality assessment;
c) after completing all repair work, present the circuit breaker for final acceptance.
2.3.2. The final acceptance of the product as a whole is carried out by representatives of the operational department together with the repair manager, for which a technical repair report is drawn up, which is signed by representatives of both parties.
3. Acceptance of the circuit breaker for repair
3.1. Before the start of a major overhaul, a commission of representatives of the operational and repair departments, with the obligatory participation of the repair manager, checks the state of readiness for repair:
a) availability of a statement of the volume of capital repair work;
b) availability of materials, spare parts, special equipment and tools;
c) the state of safety measures, labor protection and fire safety;
d) availability of a capital repair schedule.
3.2. When accepting the circuit breaker for repair, it is necessary to familiarize yourself with the list of defects and the scope of work performed during the previous major overhaul and during the period between repairs.
Technical data of the oil switch MKP-35-1000-25
(meets the requirements of GOST 687-70)
Voltage, kB:
nominal 35
highest working 40.5
Rated current, A 1000
Limit through current, kA:
effective value of periodic component 25
amplitude 63
Limit thermal stability current, kA 25
Rated shutdown current, kA 25
Shutdown power, MV-A 1750
Thermal stability current flow time, s 4
Permissible number of short circuit trips without circuit breaker inspection 5
Weight, kg:
switch with drive (without oil) 2750/2830
drive 310
transformer oil 800
Technical data of the electromagnetic drive PE-31
(meets the requirements of GOST 688-67)
Nominal voltage of the electromagnet, V:
including 110/220
disconnecting 110/220
Limits of operational operation of the drive in terms of voltage at the terminals of its windings, % of the nominal:
closing electromagnet 85 - 110
disconnecting electromagnet 65 - 120
Current consumption of the electromagnet winding at an ambient temperature of 20 °C, A:
including 248/124
disconnecting 10/5
Current consumption of the contactor switching winding at a voltage of 110/220 V, A 2/1
Resistance of electromagnet windings, Ohm:
including (one section) 0.85 - 0.92
disconnecting (one section) 20.25 - 23.75
4. Disassembling the switch
4.1. General instructions for defecating the circuit breaker
4.1.1. Inspect the switch, make sure there are no oil leaks. If there is a leak, determine the cause.
4.1.2. Check that the switch frame is installed correctly and that its upper base is horizontal.
4.1.3. Inspect the fastening of the frame to the foundation (anchor bolts must have locknuts). The frame must be reliably grounded with a steel strip with a cross-section of at least 25×4 mm.
4.1.4. Check the condition of the winch and cable.
4.1.5. Make sure the safety valve rupture screw is intact.
4.1.6. Carry out several test switches on and off; determine the preliminary scope of repairs.
4.2. Disassembly and assembly of bushings that cannot be replaced
4.2.1. Disconnect the tires.
4.2.2. Unscrew the locking screws 2 (Fig. 1), unscrew the nuts 1 and the cap with tip 3.
4.2.3. Unscrew the locking screw II from the nut 10, remove the gasket (brass washer) 4, the centering washer 5 and the gasket 6.
Note. Work according to clause 4.2 should be carried out with the switch in the on position in order to avoid turning the current-carrying rod 9 in the capacitor sleeve 8.
4.2.4. Unscrew the nuts. Remove casing 7.
4.2.5. Carry out fault detection of inputs in accordance with clause 6.8.
4.2.6. Install casing 7, screw on the nuts.
4.2.7. Install rubber gasket 6, centering washer 5, gasket (brass washer) 4, screw in nut 10, screw in locking screw 11.
4.2.8. Screw on the cap with tip 3, nuts 1 and screw in locking screws 2.
4.3. General operational disassembly of the circuit breaker
4.3.1. Drain the oil from the switch tanks into a previously prepared container. Check the operation of the oil indicators.
4.3.2. Turn off the oil heating device in the tanks.
4.3.3. Place the cable on the rollers 3 of the tank (Fig. 2), and pull it lightly. Unscrew the nuts from the bolts securing the tank, remove the washers, lower tank 1 until the cable is completely loosened, remove the cable from the tank rollers. The tanks of the other two phases are lowered similarly.
4.3.4. Unscrew the bolts securing screen 1 (Fig. 3), lower the screen until it stops against the traverse.
4.3.5. Unscrew the bolts securing the housing 2 to the holder 3, lower the housing with the camera.
4.3.6. Lift the screen and place it on the bottom of the bakelite bushing. Take out the body and camera, then remove the screen.
4.3.7. Disconnect the outer and inner ends connected to current transformer 2 (see Fig. 2). Check for markings first. If not available, apply.
4.3.8. Unscrew the nuts and remove the current transformers.
Note. Only remove current transformers when they need to be replaced or dried.
4.3.9. Unscrew the nuts from the input bolts, remove the input and gasket (dismantle the input only if necessary).
5. Preparation for defect detection and repair
5.1. Thoroughly clean the components and parts from dirt, old lubricant residues and corrosion-mechanical wear products, rinse in B-70 gasoline and dry for inspection and identification of defects.
5.2. Remove traces of corrosion, varnish, and paint with sandpaper, cleaning these areas to a metallic shine.
6. Technical requirements for defect detection and repair of circuit breaker parts and assemblies
6.1. Bolts, studs, nuts, threaded connections are subject to rejection if:
a) cracks;
b) dents, nicks, chipping of more than two turns;
c) bent bolt (stud) more than 1 mm per 100 mm of length.
6.1.1. Edges and corners on bolt heads and nuts should not be crushed or cut off. If the edges are worn more than 0.5 mm (from the nominal size), the bolt or nut is rejected.
6.1.2. Holes for cotter pins in bolts and studs should not be clogged and should be noticeably enlarged.
6.1.3. When disassembling, serviceable studs should not be removed from parts. A tight and tight fit of the studs is checked by tapping. If a rattling sound is heard, the pin should be unscrewed and the fit restored.
6.2. Shafts, axles.
6.2.1. Axles must be replaced if:
a) wear in diameter, ovality in places of wear;
b) axial curvature of more than 0.2 - 0.3 mm;
c) cracks, scuffs on the friction surfaces of shafts and axles;
d) saddles on the working friction surfaces of shafts and axles.
6.2.2. Shafts and axles should be straightened in a cold state with light blows of a hammer on a stable support. To prevent damage to parts, place wooden or lead spacers on the support and under the hammer. Check the curvature using a plumb line.
6.2.3. It is allowed to reduce the shaft, axle and ellipse of the part at the wear site by no more than 0.4 mm; check the diameter and ellipse of the shafts and axes with a micrometer.
6.2.4. It is allowed to increase the diameter of the holes and their ellipse by no more than 0.4 mm. Check the diameter and ellipse of the hole with a caliper.
6.2.5. Remove burrs on the surfaces of the axles carefully with a fine file or sandpaper.
6.2.6. Saddles and dents on the working surfaces of the axles are determined by measuring the smallest diameter in deformed areas. Filing of saddles and dents on working surfaces is not allowed.
6.3. Lock washers and spring washers must be discarded:
a) in the presence of cracks and fractures;
b) with loss of elasticity;
c) if the spread of the spring washers is less than one and a half of its thickness.
6.3.1. The normal spread of the washer is equal to twice its thickness, the acceptable one is one and a half.
6.3.2. If the fit is loosened or the alignment pins are worn, expand the hole under them and install repair size pins.
6.4. Cylindrical coil springs are subject to rejection if:
a) cracks and breaks;
b) uneven pitch of coils along the entire length of the spring of more than 10%;
c) deviations of the spring axis from the perpendicular to the end plane of more than 5 mm per 100 mm of length;
d) loss of spring elasticity is allowed within 5 - 10% of the normal value.
6.5. Seals.
6.5.1. Self-clamping oil seals are subject to rejection if:
a) dents, deep scratches and other mechanical damage to the body and cover;
b) cracks, cuts, tears, deep scratches on the surface of the cuff in contact with the shaft;
c) loose fit of the oil seal seal in the housing;
d) breakage or damage to the spring.
6.5.2. All felt seals and seals must be replaced during major repairs.
6.6. Sealing gaskets.
6.6.1. Cardboard gaskets should not have any torn spots or tears.
6.6.2. The uneven thickness of the gasket should not exceed 0.1 mm along the entire length.
6.6.3. The surface of the gasket must be smooth, clean, without folds or wrinkles.
6.6.4. Rubber gaskets should not have cracks, shear, or residual deformation. If the listed defects are present or the gasket loses elasticity, replace it.
6.7. Current transformers
6.7.1. Measure the insulation resistance of the secondary winding with a megohmmeter for a voltage of 1000 V. The insulation resistance of the secondary winding with connected secondary circuits must be at least 1 MOhm.
6.7.2. Check the condition of insulation surfaces. Wrap the damaged areas with keeper tape, varnish with bakelite varnish, and dry.
6.8. Technical requirements for defect detection and repair of circuit breaker assembly units.
6.8.1. Movable contact
Quantity per product - 3.
1. Cracks and deformation are not allowed.
3. After filing, indentations of no more than 0.5 mm are allowed.
6.8.2. Capacitor input (Fig. 1)
Quantity per product - 6.
|
Position in the picture |
Possible defect |
Method for eliminating the defect |
|
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Cracks, chips with a total area of more than 10 cm2 |
Inspection. Measurement. Ruler |
Replace |
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The same area up to 10 cm 2 |
Inspection. Measurement. Ruler |
Clean, degrease, coat with a layer of bakelite varnish |
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Oxidation, carbon deposits |
Clear |
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Partial chipping of the putty of reinforcement joints |
Finish with subsequent varnish coating |
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Cracks, peeling of mastic from the walls |
Replace |
Technical requirements for the repaired part
1. The insulation resistance must be at least 1000 MOhm.
2. Dielectric loss tangent tgd should be no more than 3% (at a temperature of 20 × 5 °C).
3. The bushing must withstand the high voltage test of 95 kV for 5 minutes.
4. Ohmic input resistance is no more than 60 μOhm.
6.8.3. Arc chute (Fig. 3)
Quantity per product - 6.
|
Position in the picture |
Possible defect |
Defect identification method and control tool |
Method for eliminating the defect |
|
Burning, melting and shells |
File down, maintaining the original shape. Sinkholes on the contact surface with a depth of no more than 0.5 mm are allowed. Restore silver coating using electric spark method |
||
|
Warping and burning of insulating plates |
Replace |
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Burnout of more than 2/3 of the compound layer |
Replace |
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More than 1/4 of the thickness of the flexible connection package is broken |
Replace |
Technical requirements for the repaired part
1. Cracks and deformations are not allowed.
2. Breaking the thread on more than one turn is not allowed.
3. Cut off torn sheets with a break less than 1/4 of the thickness.
6.8.4. Tank (item 1 fig. 2)
Quantity per product - 3.
|
Position in the picture |
Possible defect |
Defect identification method and control tool |
Method for eliminating the defect |
|
Oil indicator leaking |
Replace the defective part, clean the oil indicator glass |
||
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Significant warping of in-tank insulation |
Inspecting a tank that is not filled with oil |
Replace |
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Eliminate by editing |
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Cracks in welds |
Inspecting the oil-filled tank |
Eliminate with tea leaves |
|
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Damage to anti-corrosion coating |
Clean damaged areas, degrease, restore coating |
||
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Oil drain valve leaking |
Coat with putty and paint with oil paint |
Technical requirements for the repaired part
Cracks and deformations are not allowed.
7. Assembly components switch
7.1. Installation of entries
7.1.1. Place the gasket on the cover hole under the input flange, lift the input onto the switch, carefully install it into the cover hole, center until the axes of the mounting holes coincide. Finally adjust the input position. Secure the inlet to the cover with bolts and nuts and washers. To avoid transfer, tighten the nuts alternately diagonally.
7.2. Assembly of arc extinguishing device and contact system
7.2.1. Attach flexible connections 4 to holder 3 (see Fig. 3) and fixed contact 6. Make sure that the ends of the bolts securing the flexible connections do not go inside the annular recess of the cup in which spring 5 is located.
7.2.2. Install spring 5, screw in the guide bolt. Make sure that the cuts of the bolt head are located opposite the holes in the wall of the brass glass.
7.2.3. Install housing 2, secure with bolts to holder 3.
7.2.4. Assemble a set of insulating plates 7, secure them to the body with 2 insulated bolts.
7.2.5. Lift the screen and place it on the bottom of the bakelite bushing.
7.2.6. Install the camera onto the current-carrying input rod and secure it using pads and bolts.
7.2.7. Check the camera installation dimensions:
Deviation from the vertical ± 1 mm at the full height of the camera;
The distance from the camera to the axis of the guide pipe is within 90 ± 1 mm.
In this case, the moving contacts must move in the chamber without touching its walls.
Adjustment is made by changing the position of the camera on the current-carrying rod.
7.2.8. Fix the position of the camera on the current-carrying input rod with a locking screw.
7.2.9. Place screen 1 on the camera and secure it with bolts.
8. Switch adjustment
8.1. Check the operation of the drive mechanism. Turn on the switch slowly using a DV-33 jack. At the same time, check whether there are areas where the moving system is stuck and an increase in the muscular effort required to turn on is felt. During the switching process (during the entire stroke), loosen the force on the jack handle several times, creating the possibility of reverse motion of the moving system.
Check whether the moving system of the switch will stop (freeze) in any intermediate position.
8.2. Check the correct position of the drive mechanism levers using a template (Fig. 4).
When the levers are in the correct position, the axles of the drive mechanism should touch the template. An undershoot of the middle axis relative to the template line by 2 - 3 mm is allowed.
Attention! The transition of the middle axis beyond the template line towards the thrust pin is not allowed.
8.3. Non-compliance with the axle position pattern can be adjusted by shortening or lengthening the rods between the drive mechanisms of different phases by screwing in their tips.
If there is an equal discrepancy between the pattern of all three phases, adjustment should be made by changing the length of the vertical rod going to the drive.
8.4. Check the gap (1.5 - 2 mm) between the drive mechanism lever and the thrust pin.
Adjust the position of the stop pin in the on position of the switch.
8.5. Check the full stroke of the moving contact.
With the switch in the “on” position, make a mark on the rod at the lower end of the guide pipe. Turn off the switch and mark the rod again.
The full stroke of the rod is 270 - 280 mm.
8.6. Check the simultaneous closure of the pole contacts (discrepancy of no more than 2 mm is allowed), the closure of contacts between poles (divergence of no more than 4 mm).
Adjust:
a) lowering or raising cameras with fixed contacts;
b) screwing or unscrewing the movable contacts (rods) in the traverse liners.
8.7. Measure the contact resistance of each pole (no more than 300 μOhm). Measure with the secondary winding of the current transformers closed to the operating load or short-circuited.
8.8. Take a vibration record, check the speed of movement of the moving contacts of the switch (without oil) when turning it off and on:
at the moment of contact opening - 1.7 - 2.3 m/s and 1.8 - 2.6 m/s; maximum - 3.0 - 3.6 m/s and 2.1 - 5.9 m/s, respectively.
It is recommended to check simultaneity, contact travel (pressing in - 16 ± 1 mm), and take speed and time characteristics using the remote control (Fig. 5).
9. Drive repair
9.1. Drive Inspection
9.1.1. Clean and inspect all accessible parts of the drive from dust, dirt and old grease, check:
a) the condition of the axles and springs;
b) drive mount;
c) degree of corrosion of parts;
d) absence of dents and hardening on working surfaces.
Carry out defect detection and repair of drive parts in accordance with Section. 6.
9.1.2. Check for distortion and jamming of the electromagnet cores.
9.1.3. Pay attention to the reliability of the connections and their fastening.
9.1.4. Pay special attention to the presence in all links of the transmission mechanisms of devices that prevent spontaneous unscrewing (lock nuts, spring washers, etc.).
9.1.5. Inspect the block contacts KBO and KKB. Pay attention to the condition of the moving and fixed contacts, springs, clamps, contact screws, rods and levers.
9.1.6. Specify the final scope of drive repair. Disassemble the drive only if faults are detected that interfere with further normal operation of the drive.
9.2. Drive regulation
Attention! To avoid injury in case of accidental shutdown during drive adjustment, it is necessary to screw the safety bolt 6 (Fig. 6) all the way to the shutdown pawl 5. When shutting down or completing the adjustment, unscrew bolt 6, setting the gap to 13 - 15 mm.
9.2.1. Maintain gaps and recesses of pawls in accordance with Fig. 6. Adjust the drop value of 5 - 8 mm of the disconnecting pawl 5 with bolt 2 and screw 4.
9.2.2. Check the reliability of engagement of lever 3 with the latch when the release pawl 5 rests against bolt 6. Adjust with bolt 1.
9.2.3. Check that the position of the KBB and KBO contacts corresponds to the position of the switch. The on position of the switch must correspond to the off position of the KBB contact and the on position of the KBO contact.
9.2.4. Check the opening of the KBV block contacts at the end of the drive activation stroke. The test is carried out at a minimum voltage (93.5/187 V) at the terminals of the switching electromagnet at the moment of switching on.
9.2.5. Adjust the gap between the pawls and ratchets at the block contacts in accordance with Fig. 7. Adjustment is made by moving the fork 4 (Fig. 8) along the rod 3 and moving the threaded pin 2. The fork 4 should rotate on the rod 3.
Attention! To avoid damage to the transmission links of the block contacts, be careful when adjusting and attach the rod to the levers only after first checking its length in both extreme positions of the drive.
9.2.6. Coat the core of the switching electromagnet with a special lubricant (one part CIATIM-203 and one part amorphous or silver graphite).
10. Final assembly and circuit breaker testing
10.1. Clean the tank from dirt, wipe it, check the serviceability of the internal insulation.
10.2. Check the serviceability of the oil drain valves and electric heating. Turn on the tubular heaters at a voltage equal to 50% of the nominal voltage for 2 hours - for drying.
10.3. Install a removable winch, put the winch cable on the tank rollers 3 (see Fig. 2) and use the winch to lift the tanks and secure them.
10.4. Measure the shaft rotation angle, which should be 57°.
10.5. Fill the tanks with oil, the breakdown voltage of which is not lower than 35 kV. When filling, check the operation of the oil indicators and check for leaks. After filling and settling the oil, take a sample. The breakdown voltage of the oil must be at least 30 kV.
10.6. Paint the switch.
10.7. Connect tire deflations.
10.8. Determine the minimum voltage of the closing electromagnet at which the drive is able to turn on the switch without load.
10.9. Determine the lowest voltage of the tripping electromagnet at which the drive is able to trip the circuit breaker.
10.10. Check the joint operation of the switch with the drive by turning the switch on and off five times.
10.11. Before commissioning, test the switch with a voltage of 95 kV for 1 minute.
Appendix 1
List of tools required for overhaul of the circuit breaker
|
Name |
Designation |
Standard designation |
Quantity, pcs. |
|
|
1. Open-end wrenches, double-sided: |
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|
Key 7811-0003 |
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|
Key 7811-0021 |
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|
Key 7811-0022 |
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|
Key 7811-0023 |
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|
Key 7811-0025 |
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|
2. Open-end wrenches, single-sided: |
||||
|
Key 7811-0142 |
||||
|
Key 7811-0146 |
||||
|
3. Pipe lever wrench No. 1 |
||||
|
4. Combination pliers, 200 mm long |
Pliers, 200 |
|||
|
5. Flat, blunt-nosed file |
File 2820-0029 |
|||
|
File 2820-0029 |
||||
|
6. Screwdriver for mechanics |
Screwdriver 7810-0309 |
|||
|
7. Bench hammer, steel, weighing 400 g |
Hammer 7850-0034 |
|||
|
8. Metric measuring ruler |
Line 1-500 |
|||
|
Line 1-150 |
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|
9. Vernier caliper |
||||
|
10. Bar level |
Level 150 mm long |
|||
|
13. Manual jack |
||||
|
14. Device for taking vibrograms |
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|
15. Template |
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|
16. Electric drill |
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|
17. Drills with a diameter of 6; 8 mm |
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|
18. Taps |
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Appendix 2
List of devices used during repairs
|
Name and designation |
Purpose and brief description |
|
1. Portable bridge - MD-16 |
Device for measuring capacitance and dielectric loss angle tgd |
|
2. Megaohmmeter M-1101 |
1000 V insulation resistance measurement |
|
3. Microohmmeter M-246 |
Measuring contact resistance |
|
4. Vibrograph |
Vibrogram removal, 12 V |
|
5. Voltmeter E-L5 |
0-600 V, class 0.5 |
|
6. Switch adjustment panel. Development of the Yuzhenergoremont enterprise |
Checking the simultaneous closure of contacts of a pole and between poles, taking characteristics, power supply of a vibrograph, lighting |
|
7. Installation for silvering by electrospark method EFI-54 |
Restoration of silver-plated contact surfaces (in the workshop only). The thickness of the applied layer is 0.01 mm. Maximum productivity up to 10 cm 2 /min |
|
8. Folding pocket magnifying glass LP-1-7* |
|
|
9. RSPS dual resistor |
340 ohms ± 10% 1 A - in series 2 A - parallel |
Appendix 3
Standards for material consumption for major repairs of a circuit breaker
|
Name |
Standard designation |
Consumption rate for repairing one circuit breaker |
|
Transformer oil TKp, kg |
||
|
Grease CIATIM-203, kg |
||
|
Aviation gasoline B-70, l |
||
|
Wiping rags, kg |
||
|
Sanding paper, different, m 2 |
||
|
Paint yellow, red, green, gray, kg |
As needed |
|
|
Electrical insulating cardboard EM, 1 mm thick, kg |
||
|
Technical sheet rubber, kg: |
||
|
Bakelite varnish, kg |
||
|
Different cotter pins, kg |
||
|
Drying oil oxol, kg |
||
|
Putty, kg |
||
|
Tow, kg |
||
|
Red lead, kg |
||
|
Keeper tape |
Appendix 4
Spare parts kit available upon special order
Appendix 5
List of main indicators of the technical condition of the circuit breaker after major repairs
Power system (REU) _________________________________________________
Enterprise _________________________________________________
Statement
main indicators of the technical condition of the circuit breaker after major repairs
Type ______________________ Manufacturer __________________________
Serial number _______________________ Year of manufacture ________________
Reason for repair ________(scheduled, extraordinary, after shutdown_________
maximum number of short circuits)______________________________
_____________________________________________________________________
Start of repairs ____________________________ (date)
Completion of repairs _________________________ (date)
1. List of overhaul of circuit breaker assembly units (filled out for assembly units that required replacement or overhaul of parts)
2. Switch adjustment
|
Characteristic |
Measurement results |
|||
|
Full stroke of moving contacts, taking into account the stroke in the buffer, mm |
||||
|
Stroke in contacts (pressing), mm |
||||
|
Different times of pole contact closure, mm, no more |
||||
|
Different times of contact closure between poles, mm, no more |
||||
|
Transition resistance of the current-carrying circuit, μOhm, no more |
||||
3. Testing a switch with an electromagnetic drive
|
Characteristic |
Measurement results |
|||
|
Minimum switching voltage at the terminals of the switching coil, V, no more |
||||
|
Resistance of one section of the switching coil, Ohm |
||||
|
Resistance of one section of the trip coil, Ohm |
||||
|
Speed of moving contacts, m/s |
||||
|
at the moment of opening |
||||
|
maximum |
||||
|
Speed of moving contacts |
||||
|
when turned on and there is no oil in the tanks (at the moment the contacts close, maximum) Rice. 8. Transmission from the drive shaft to high-speed contact blocks: 1 - shaft; 2 - finger; 3 - traction; 4 - plug
| ||||
