CQ6型气动操动机构断路器合后即分故障分析

Fault Analysis on Instant Opening after Closing of CQ6 Pneumatic Operating Mechanism for Circuit Breaker

摘要:

电网正常运行时，断路器为电网的安全提供了重要保障。气动操作机构是断路器的重要组成部分，操作机构的可靠性很大程度上影响了断路器的可靠性，保证气动操作机构的可靠性非常重要。文中对西安西电开关有限公司的GIS设备断路器配备CQ6型气动操动机构存在合闸即刻跳闸的现象，从电气回路、机构机械传动、零部件材料检测等多方面进行综合分析，剖析了机构缺陷的根本原因。最终得出机构分合操动异常情况与机构零部件材料及设计基本无关，主要原因在于分闸铁芯复位弹簧过短且弹力不足，并提出了处理防范措施，供同行参考。

Abstract:

During the normal operation of power grid, the circuit breaker provides an important guarantee for the safety of power grid. Pneumatic operating mechanism is an important part of circuit breaker, and the reliability of operating mechanism greatly affects the reliability of circuit breaker. So it is very important to ensure the reliability of pneumatic operating mechanism. Aiming at the phenomenon of instant opening after closing of CQ6 pneumatic operating mechanism for circuit breaker of GIS equipment manufactured by Xi′an Xidian Switchgear Co., Ltd., the root causes of mechanism defects are analyzed from the aspects of electrical circuit, mechanism mechanical transmission, parts and materials detection and so on.Finally, it is concluded that the abnormal opening and closing operation of the mechanism has nothing to do with the parts, materials and design. The main reason is that the return spring of opening iron core is too short and the elastic force is insufficient. The treatment and preventive measures are put forward for reference.