Study on Damage to Vacuum Circuit Breaker and Countermeasures

Due to changing the structure of the return oil circuit, the pressure loss factor is lower than the original circuit breaker when the oil return path is in this state, thus compensating for the decrease of the rigid velocity due to the temperature decrease and ensuring that the circuit breaker is opened with the required speed characteristics. When the temperature is higher, the opening degree of the throttle valve is adjusted to increase the pressure loss factor of the return oil passage and limit the rise of the opening speed caused by the increase of the temperature. The minimum opening of the throttle valve shall be such that the opening speed of the circuit breaker does not exceed the upper limit at high temperatures, ie, the pressure loss factor of the return valve at the throttle opening should be the same as before the speed compensation device is not used, so as to ensure The reliable breaking of the circuit breaker. In specific implementation, a solenoid valve may be used to send a signal through the control cabinet to adjust the opening of the throttle valve. In the normal working state, when the monitoring machine closes the closing command, the closing signal relay (HxJ) is activated, the weak closing circuit is turned on, and the closing relay (HJ) is actuated, and the normally open contact is closed. If the vacuum circuit breaker is in the open position and the operating mechanism has stored energy, the normally closed contact of the circuit breaker (DL) auxiliary switch is turned on, the closing coil is tripped, the switch is closed, and the normally closed contact of the auxiliary switch is broken. On, closing circuit is in open circuit. When the monitoring machine issues a closing command, it will cause the closing circuit to live for a long time and it is easy to burn the equipment and components in the closing circuit. The closing method is the real cause of the failure when the breaker operating mechanism is not stored. When the circuit breaker is not closed due to mechanical reasons, the energy storage circuit is cut off and it is also shown that the mechanism does not store energy. The trip switch (cK) in the circuit breaker operating mechanism is a monitoring switch that reflects the state of energy storage. The normally closed contact in the trip switch is activated and the strong power closing circuit is connected in series. When the mechanism does not store energy, the cK-2 and cK books are in the open state. When the closing command is issued or the switch is not closed, the closing circuit is always kept open, and the limit switch cK acts as a locking function, so that the closing coil can be protected. And closing relays.

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