220kV断路器分合闸速度异常下降分析

Analysis of Abnormal Decrease in Opening and Closing Speed of 220 kV Circuit Breaker

断路器是电力系统中的保护性装置。当发生电力事故时,断路器需要及时响应,因此,断路器机械特性是保证正常工作的关键。分析了一起220 kV断路器分合闸速度下降的案例,通过多次调节分合闸弹簧以及对结构的进一步分析,判定本次异常是由断路器气室连杆与气室密封件摩擦阻力过大、存在卡涩现象导致。通过在气室连杆涂抹硅脂进行润滑处理,分合闸速度得到恢复,机械特性试验数据符合标准,断路器得以正常投运。该研究不仅解决了实际问题,还强调了定期检查和润滑的重要性,为电力系统中断路器的维护提供了宝贵经验。

A circuit breaker is a protective device in the power system.In the event of a power accident,the circuit breaker needs to respond in a timely manner.Therefore,the mechanical characteristics of the circuit breaker are key to ensuring normal operation.This article analyzes a case of a 220 kV circuit breaker with a decrease in opening and closing speed.Through multiple adjustments of the opening and closing springs and further analysis of the structure,it is determined that the abnormality is caused by excessive friction resistance and jamming between the circuit breaker's air chamber connecting rod and the air chamber sealing element.By applying silicone grease to the air chamber connecting rod for lubrication,the opening and closing speed was restored,and the mechanical characteristic test data met the standards.The circuit breaker was able to be put into normal operation.This study not only solves practical problems,but also emphasizes the importance of regular inspection and lubrication,providing valuable experience for the maintenance of circuit breakers in power systems.