Reason analysis and countermeasure of opening failure of 220 kV circuit breaker

Abstract

Among power generation, transmission and use, distribution is an extremely important link. The distribution system includes a transformer and a variety of high and low voltage electrical equipment, the circuit breaker is a large amount of electrical appliances. The circuit breaker can be used to distribute electric energy, the asynchronous motor is not frequently started and the power line and motor is protected. The utility model can automatically cut off the circuit when the overload, short circuit and under voltage fault occur, and the utility model is equivalent to the combination of the fuse type switch and the over low thermal relay. In this paper, the problem of the failure of Qixian 220kV circuit breaker is analyzed. It is concluded that the gap of the switch electromagnet in the circuit breaker is changed and the hammer and trigger gap is too large. After the operation of the gate and non full phase protection, the top cannot trigger, thus unable to brake the conclusion.