Reasons and treatment methods of high-voltage circuit breaker refusal to trip
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- Time of issue:2021-08-30
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(Summary description)Due to the frequent operation of high-voltage circuit breakers, they often fail to trip due to mechanical and electrical factors. For the circuit breaker that has been put into operation, when the fault reappears on the load side of the circuit breaker, once a refusal trip occurs, it will inevitably cause skipping trips, expanding the scope of accidents and power outages, so it should be eliminated as soon as possible.
1. Reasons for circuit breaker refusal to trip
There are usually two reasons why the circuit breaker refuses to trip: one is the failure of the mechanical part of the operating mechanism, and the other is the electrical failure of the operating circuit.
When the circuit breaker refuses to trip, the person on duty should first judge whether the trip circuit is intact according to the light indication. If the red light does not light up, it means that the trip circuit is blocked. At this time, check whether the operating fuse is blown or poorly contacted, whether the contact of the universal transfer switch and the auxiliary contact of the circuit breaker are poorly connected, whether the coil of the anti-trip relay is broken, whether the operating circuit is broken, whether the bulb or lamp is broken Wait intact.
If the operating power is good and the tripping core is weak, it means that the tripping coil's operating voltage is too high, or the operating voltage is too low, the tripping core is jammed or detached, or the tripping coil itself is faulty. If the tripping iron core ejector rod is well transported and the circuit breaker refuses to trip, it may be that the mechanism is jammed or the drive connecting rod pin is detached.
2. Handling method for circuit breaker refusal trip
After the reasons for the refusal to jump are ascertained, the personnel on duty should be calm and calm and adopt different solutions according to the nature of the failure. If the red signal light does not light up during the normal opening operation, after confirming that the lamp is in good condition, the operating fuse should be quickly replaced before the opening operation. At this time, it should be carried out by two persons, one person operating the change-over switch remotely, and the other person observing the action of the opening iron core on the spot, while keeping a safe distance. If the action of the iron core is weak, the iron core is blocking; if the opening iron core is operating normally, but the circuit breaker cannot be tripped, it means that the mechanical anti-jamming is indicated. At this time, a mechanical opening device should be used to interrupt the circuit breaker on the spot. For air circuit breakers and SF6 circuit breakers, the air pressure must be normal before the mechanism can be interrupted.
When it is necessary to open the circuit breaker in an emergency situation, such as the operation of the relay protection device or the manual remote opening of the circuit breaker refused to open, which may cause damage to the main equipment, the person on duty should immediately open the upper-level circuit breaker manually, and then go to Use a mechanical opening device to interrupt the circuit breaker at the fault circuit breaker; if the mechanical opening device cannot open the circuit breaker, you should quickly open the isolation switches on both sides of the fault circuit breaker, and then restore the upper-level power supply. The cause is to be found out. Deal with it again; if the time permits in the accident state, the personnel on duty should quickly run to the fault circuit breaker and use a mechanical opening device to disconnect the circuit breaker; if the mechanical opening device cannot be used to open the circuit breaker, the operation mode should be changed immediately, or Use the bus tie circuit breaker and the upper-level circuit breaker to disconnect, and then use the isolating switch to isolate the fault circuit breaker and restore the operation mode.
Therefore, it is recommended to use the DGK-S high-voltage switch dynamic characteristic tester to test the high-voltage circuit breaker on a regular basis in order to eliminate the fault in time. DGK-S high-voltage switch dynamic characteristic tester is a special high-voltage switch developed and produced by Dingsheng Electric Power Research and Development Center to adapt to the dynamic characteristics of various indoor and outdoor oil-less, multi-oil switches, vacuum switches, and sulfur hexafluoride switches. Dynamic characteristic tester, the internal processing of DGK-S high-voltage switch dynamic characteristic tester is based on the single-chip microcomputer as the core for sampling, processing and output. Its main function is to use Chinese character prompts and graphic displays to operate in a man-machine dialogue mode, which is simple and fast. It is suitable for testing the mechanical characteristics of all types and voltage levels of SF6 switches, GIS combined electrical appliances, vacuum switches, an
Reasons and treatment methods of high-voltage circuit breaker refusal to trip
(Summary description)Due to the frequent operation of high-voltage circuit breakers, they often fail to trip due to mechanical and electrical factors. For the circuit breaker that has been put into operation, when the fault reappears on the load side of the circuit breaker, once a refusal trip occurs, it will inevitably cause skipping trips, expanding the scope of accidents and power outages, so it should be eliminated as soon as possible.
1. Reasons for circuit breaker refusal to trip
There are usually two reasons why the circuit breaker refuses to trip: one is the failure of the mechanical part of the operating mechanism, and the other is the electrical failure of the operating circuit.
When the circuit breaker refuses to trip, the person on duty should first judge whether the trip circuit is intact according to the light indication. If the red light does not light up, it means that the trip circuit is blocked. At this time, check whether the operating fuse is blown or poorly contacted, whether the contact of the universal transfer switch and the auxiliary contact of the circuit breaker are poorly connected, whether the coil of the anti-trip relay is broken, whether the operating circuit is broken, whether the bulb or lamp is broken Wait intact.
If the operating power is good and the tripping core is weak, it means that the tripping coil's operating voltage is too high, or the operating voltage is too low, the tripping core is jammed or detached, or the tripping coil itself is faulty. If the tripping iron core ejector rod is well transported and the circuit breaker refuses to trip, it may be that the mechanism is jammed or the drive connecting rod pin is detached.
2. Handling method for circuit breaker refusal trip
After the reasons for the refusal to jump are ascertained, the personnel on duty should be calm and calm and adopt different solutions according to the nature of the failure. If the red signal light does not light up during the normal opening operation, after confirming that the lamp is in good condition, the operating fuse should be quickly replaced before the opening operation. At this time, it should be carried out by two persons, one person operating the change-over switch remotely, and the other person observing the action of the opening iron core on the spot, while keeping a safe distance. If the action of the iron core is weak, the iron core is blocking; if the opening iron core is operating normally, but the circuit breaker cannot be tripped, it means that the mechanical anti-jamming is indicated. At this time, a mechanical opening device should be used to interrupt the circuit breaker on the spot. For air circuit breakers and SF6 circuit breakers, the air pressure must be normal before the mechanism can be interrupted.
When it is necessary to open the circuit breaker in an emergency situation, such as the operation of the relay protection device or the manual remote opening of the circuit breaker refused to open, which may cause damage to the main equipment, the person on duty should immediately open the upper-level circuit breaker manually, and then go to Use a mechanical opening device to interrupt the circuit breaker at the fault circuit breaker; if the mechanical opening device cannot open the circuit breaker, you should quickly open the isolation switches on both sides of the fault circuit breaker, and then restore the upper-level power supply. The cause is to be found out. Deal with it again; if the time permits in the accident state, the personnel on duty should quickly run to the fault circuit breaker and use a mechanical opening device to disconnect the circuit breaker; if the mechanical opening device cannot be used to open the circuit breaker, the operation mode should be changed immediately, or Use the bus tie circuit breaker and the upper-level circuit breaker to disconnect, and then use the isolating switch to isolate the fault circuit breaker and restore the operation mode.
Therefore, it is recommended to use the DGK-S high-voltage switch dynamic characteristic tester to test the high-voltage circuit breaker on a regular basis in order to eliminate the fault in time. DGK-S high-voltage switch dynamic characteristic tester is a special high-voltage switch developed and produced by Dingsheng Electric Power Research and Development Center to adapt to the dynamic characteristics of various indoor and outdoor oil-less, multi-oil switches, vacuum switches, and sulfur hexafluoride switches. Dynamic characteristic tester, the internal processing of DGK-S high-voltage switch dynamic characteristic tester is based on the single-chip microcomputer as the core for sampling, processing and output. Its main function is to use Chinese character prompts and graphic displays to operate in a man-machine dialogue mode, which is simple and fast. It is suitable for testing the mechanical characteristics of all types and voltage levels of SF6 switches, GIS combined electrical appliances, vacuum switches, an
- Categories:Industry News
- Author:
- Origin:
- Time of issue:2021-08-30
- Views:0
Due to the frequent operation of high-voltage circuit breakers, they often fail to trip due to mechanical and electrical factors. For the circuit breaker that has been put into operation, when the fault reappears on the load side of the circuit breaker, once a refusal trip occurs, it will inevitably cause skipping trips, expanding the scope of accidents and power outages, so it should be eliminated as soon as possible.
1. Reasons for circuit breaker refusal to trip
There are usually two reasons why the circuit breaker refuses to trip: one is the failure of the mechanical part of the operating mechanism, and the other is the electrical failure of the operating circuit.
When the circuit breaker refuses to trip, the person on duty should first judge whether the trip circuit is intact according to the light indication. If the red light does not light up, it means that the trip circuit is blocked. At this time, check whether the operating fuse is blown or poorly contacted, whether the contact of the universal transfer switch and the auxiliary contact of the circuit breaker are poorly connected, whether the coil of the anti-trip relay is broken, whether the operating circuit is broken, whether the bulb or lamp is broken Wait intact.
If the operating power is good and the tripping core is weak, it means that the tripping coil's operating voltage is too high, or the operating voltage is too low, the tripping core is jammed or detached, or the tripping coil itself is faulty. If the tripping iron core ejector rod is well transported and the circuit breaker refuses to trip, it may be that the mechanism is jammed or the drive connecting rod pin is detached.
2. Handling method for circuit breaker refusal trip
After the reasons for the refusal to jump are ascertained, the personnel on duty should be calm and calm and adopt different solutions according to the nature of the failure. If the red signal light does not light up during the normal opening operation, after confirming that the lamp is in good condition, the operating fuse should be quickly replaced before the opening operation. At this time, it should be carried out by two persons, one person operating the change-over switch remotely, and the other person observing the action of the opening iron core on the spot, while keeping a safe distance. If the action of the iron core is weak, the iron core is blocking; if the opening iron core is operating normally, but the circuit breaker cannot be tripped, it means that the mechanical anti-jamming is indicated. At this time, a mechanical opening device should be used to interrupt the circuit breaker on the spot. For air circuit breakers and SF6 circuit breakers, the air pressure must be normal before the mechanism can be interrupted.
When it is necessary to open the circuit breaker in an emergency situation, such as the operation of the relay protection device or the manual remote opening of the circuit breaker refused to open, which may cause damage to the main equipment, the person on duty should immediately open the upper-level circuit breaker manually, and then go to Use a mechanical opening device to interrupt the circuit breaker at the fault circuit breaker; if the mechanical opening device cannot open the circuit breaker, you should quickly open the isolation switches on both sides of the fault circuit breaker, and then restore the upper-level power supply. The cause is to be found out. Deal with it again; if the time permits in the accident state, the personnel on duty should quickly run to the fault circuit breaker and use a mechanical opening device to disconnect the circuit breaker; if the mechanical opening device cannot be used to open the circuit breaker, the operation mode should be changed immediately, or Use the bus tie circuit breaker and the upper-level circuit breaker to disconnect, and then use the isolating switch to isolate the fault circuit breaker and restore the operation mode.
Therefore, it is recommended to use the DGK-S high-voltage switch dynamic characteristic tester to test the high-voltage circuit breaker on a regular basis in order to eliminate the fault in time. DGK-S high-voltage switch dynamic characteristic tester is a special high-voltage switch developed and produced by Dingsheng Electric Power Research and Development Center to adapt to the dynamic characteristics of various indoor and outdoor oil-less, multi-oil switches, vacuum switches, and sulfur hexafluoride switches. Dynamic characteristic tester, the internal processing of DGK-S high-voltage switch dynamic characteristic tester is based on the single-chip microcomputer as the core for sampling, processing and output. Its main function is to use Chinese character prompts and graphic displays to operate in a man-machine dialogue mode, which is simple and fast. It is suitable for testing the mechanical characteristics of all types and voltage levels of SF6 switches, GIS combined electrical appliances, vacuum switches, and oil switches produced at home and abroad. It can accurately measure time, speed, and low voltage under the test conditions of the 500KV substation bypass bus bar being charged. And other functional parameters, DGK-S high-voltage switch dynamic characteristic tester has many advantages such as intelligence, strong anti-interference and high precision, and is widely favored by customers.
But it should be noted that because the circuit breaker itself is limited by the interrupting capacity, when one of the following faults occurs, it is prohibited to disconnect it to avoid explosion accidents.
(1) The oil circuit breaker has no oil or is seriously short of oil or the oil is seriously carbonized.
(2) When the two-phase insulation rod of the oil-less circuit breaker is broken.
(3) The gas circuit breaker pressure is too low and cannot be maintained.
(4) The circuit breaker with hydraulic mechanism is adopted, and the hydraulic system drops to zero hour.
Once the above phenomenon occurs, the person on duty should immediately remove the operating fuse of the circuit breaker, so that the circuit breaker cannot be disconnected from afar, even if the circuit breaker is faulty, the protection device will not open it. At the same time, the personnel on duty should hang the warning signs of "No Operation" on their operating handles and the operating machinery of the circuit breaker, and then deal with them according to the following principles.
(1) If a load of the plant (subsidiary) is disconnected and fails, the load should be transferred according to the command of the director or dispatcher, and then the bus connected to the faulty circuit breaker should be powered off, the circuit breaker should be opened, and the previous circuit breaker should be restored. The device is running.
(2) If it is true that the power supply circuit breaker of a certain factory (station) is faulty, the standby power circuit breaker should be turned on, the upper-level circuit breaker of the working power supply should be cut off, and then the fault circuit breaker should be opened.
(3) If there is a fault in the open circuit, the bus must be switched. When a bus circuit breaker or bypass circuit breaker is used instead, the relay protection specialist should be notified to adjust its fixed value, and then the relevant unit should be notified of power outage maintenance.
During the inspection, the staff on duty should take decisive measures if they find the following abnormal phenomena. First, take measures to prevent the circuit breaker from being automatically reclosed or remotely reclose, and then take remote operations to quickly open the circuit breaker to cut off the power:
(1) The circuit breaker casing is burst.
(2) The circuit breaker catches fire.
(3) A personal accident that requires immediate opening of the circuit breaker occurs.
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