基于线圈电流曲线与行程曲线的断路器操作机构故障诊断的对比研究

Comparative Research on Fault Diagnosis of Circuit-breaker Operating Mechanism Based on Coil Current Curve and Stroke Curve

为研究线圈电流曲线与行程-时间曲线在断路器操作机构故障诊断上的区别,在分析了断路器操作机构线圈电流特性和触头行程-时间特性的理论基础上,通过对断路器操作机构的机械特性的测试,对比研究了断路器操作机构故障对线圈电流与行程-时间特性的影响。通过对比研究发现,线圈电流曲线在铁芯卡涩、线圈电压电阻变化、辅助触点灭弧困难、弹簧疲软故障方面比行程-时间曲线更灵敏、更准确。研究结果对断路器操作机构状态评估方法的选择具有一定的参考意义。

In order to study the differences between coil current curve and stroke-time curve in fault diagnosis of circuit-breaker operating mechanism,based on the analysis of coil current characteristics of circuit-breaker operating mechanism and stroke-time characteristics of contacts,the influence of circuit-breaker operating mechanism failure on coil current and stroke-time characteristics is compared through testing the mechanical characteristics of circuit-breaker operating mechanism.Through comparative researches,it is found that the coil current curve is more sensitive and accurate than the stroke-time curve in terms of core pin,coil voltage resistance change,auxiliary contact arc extinguishing and spring fatigue failure.The research results have a certain reference significance in the selection of state evaluation method for circuit-breaker operating mechanism.