Method and device for preventing circuit breaker coil from burning

Abstract

The invention provides a method and a device for preventing a circuit breaker coil from burning. By means of the device for preventing the circuit breaker coil from burning, a 3SJ delayed open loop is simultaneously started when a normal circuit breaker tripping or closing loop is started during operation and line fault tripping or closing in 35 kV and 10kV power systems. The switching of a circuit breaker can be normal in 3 seconds, a 3 SJ time relay automatically loses excitation and returns, and the normal operation of the circuit breaker is not affected. After 3 seconds, the delayed normally open contact of the 3 SJ time relay is closed to start a 3 ZJ intermediate relay, a 3 ZJ normally closed contact is opened, the 3 ZJ normally closed contact opens the circuit breaker tripping and closing loops, and accordingly the probability of circuit breaker coil burning can be reduced. According to the method and the device for preventing the circuit breaker coil from burning, the delayed open loop is directly started after the normally closed contact and the normally open contact of the circuit break are connected in series, so that the aim of protecting circuit breaker tripping and closing coils is achieved.

Description

Technical field [0001] The invention provides a method to prevent the burning of the circuit breaker, solve the problem of burning the jumping coil coil, and also provides the specific device to implement this method, which belongs to the protection device technology field of 35kV and 10kV power systems. technical background [0002] At present, the phenomenon of burning phenomenon of 35kV and 10kV power system breakage bump coils occurs. The reason is that the existing cutter jumping coil coils are designed in a short period of power.The internal guide electric pole and transmission link of the circuit breaker body are killed, causing the core to refuse the division; the assistance switch position is not properly adjusted, and the frequent opening contacts and the normal closed contacts are closed at the same time;The jumping coils are allocated for a long time and caused by the burnout of the knit jumping coil.Once the jump coil coil is burned, the line is bound to stop the li...

AI Technical Summary

Problems solved by technology

[0002]Currently, the tripping and closing coils of 35KV and 10KV power systems often burn out. The reason is that the current tripping and closing coils of circuit breakers are powered on for a short time According to the design, when the tripping electromagnet fails, the trip mechanism cannot be opened by the iron core; the inner conductive rod and the transmission connecting rod of the circuit breaker body are stuck, causing the iron core to refuse to open and close; the position of the auxiliary switch is improperly adjusted, and the normally open contact occurs. The point and normally closed contacts are closed at the same time; the remote control trip circuit is self-maintained for a long time, etc., all of which form the tripping and closing coil for a long time, which causes the circuit breaker to burn out the tripping and closing coil

Once the tripping and closing coil is burned, it will inevitably cause a power outage on the line, and the consequences of less power transmission and inability to transmit power in time will greatly affect the reliability of power supply. Therefore, it is imperative to effectively strengthen the improvement measures of the circuit breaker tripping and closing coil.

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