Since the operation of the high-voltage circuit breaker is very frequent, it is often affected by mechanical and electrical factors, and there is often a phenomenon of rejection. For a circuit breaker that has been put into operation, when the fault reappears on the load side of the circuit breaker, once the refusal occurs, it will cause a step-by-step trip, which will expand the accident and power outage range, so it should be eliminated as soon as possible. Solid-state Capacitors / Motor Starting Capacitors
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1 Rejection causes There are usually two reasons for the circuit breaker to be rejected: 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 occurs, the duty officer should first judge whether the trip circuit is in good condition according to the light indication. If the red light is not bright, the trip circuit is unreachable. 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 in poor contact, whether the coil of the anti-jump relay is broken, whether the operating circuit is broken, whether the bulb or the lamp is broken. In good condition.
If the operating power is good, the tripping iron core is weak, indicating that the trip coil operating voltage is too high, or the operating voltage is too low, the tripping iron core is stuck, detached, or the tripping coil itself is faulty. If the tripping iron ejector is well transported and the circuit breaker refuses to jump, it may be that the mechanism jam or the drive link pin is disengaged.
2 After the reason for the rejection of the jump is determined, the duty officer should be calm and calm, and adopt different treatment schemes according to different fault properties. If the normal signal is turned on, the red signal light will not light. After confirming that the lamp is in good condition, the operating fuse should be replaced quickly and then the opening operation should be performed. At this time, it should be carried out by two people. One person operates the switch in the distance, and one person observes the action of the opening iron core on the spot, and at the same time pays attention to maintaining a safe distance. If the iron core is weak, it is the iron core blocking card; if the opening iron core works normally, but the circuit breaker cannot be jumped, it means the mechanical anti-card. At this point, the mechanical circuit breaker should be used to break the circuit breaker. 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 brake in the emergency state, if the relay protection device is operated or the manual remote pull is rejected, if the main equipment may be damaged, the duty personnel should immediately pull open the upper circuit breaker manually, and then The mechanical breaker device is used to break the circuit breaker at the fault circuit breaker; if the mechanical opening device cannot open the circuit breaker, the disconnector on both sides of the fault circuit breaker should be quickly disconnected, and then the power supply of the upper level power supply should be restored. If the time is allowed in the accident state, the duty officer should quickly go to the fault circuit breaker and use the mechanical opening device to open the circuit breaker; if the mechanical opening device cannot be opened, the operation mode should be switched immediately, or Use the bus-coupled circuit breaker and the upper-level circuit breaker to disconnect and reuse the isolating switch to isolate and restore the fault circuit breaker.
However, it should be noted that since the circuit breaker itself is limited by the interrupting capacity, when one of the following faults occurs, it is forbidden to disconnect it to avoid an explosion accident.
(1) The oil circuit breaker is oil-free or severely deficient in oil or severely carbonized.
(2) When the two-phase insulation tie rod of the oil-less circuit breaker is broken.
(3) The gas circuit breaker pressure is too low to be maintained.
(4) The circuit breaker with hydraulic mechanism is used, and the hydraulic system is reduced to zero.
In the event of the above phenomenon, the duty officer should immediately remove the operating fuse of the circuit breaker, so that the remote circuit cannot be disconnected. Even if the circuit breaker has a fault, the protection device will not open. At the same time, the duty officer should hang the “No Operation†warning sign on the operating mechanism of the operating handle and the circuit breaker, and then deal with it according to the following principles.
(1) If the power supply of the plant (station) is broken, the load should be transferred according to the command of the director or dispatcher, then the busbar connected to the fault circuit breaker should be powered off, the circuit breaker should be opened, and the upper circuit breaker should be restored. The device is running.
(2) If it is a fault of a working power circuit breaker of a factory (station), the standby power circuit breaker should be put into operation, the upper 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 busbar operation must be reversed. When replacing the busbar breaker or bypass breaker, the relay protection specialist shall be notified to adjust its fixed value, and then notify the relevant unit to stop the power maintenance.
When the duty officer patrols, if the following abnormal phenomena are found, decisive measures should be taken. First, the measures to prevent the open circuit from being automatically or remotely closed can be taken. Then, the remote operation is taken, and the circuit breaker is quickly opened to power off:
(1) The circuit breaker casing is broken.
(2) The circuit breaker is on fire.
(3) A personal accident occurs that requires the circuit breaker to be opened immediately.