As for the fault feature and the shortcoming of offline test of power capacitor,in this paper,the fault diagnosis method taking such parameters as operation voltage,capacitance,unbalance signal etc. as condition monitoring and measurement are proposed,and the fault identification and early warning scheme is designed normally with combination of related rules. The internal fault of power capacitor is simulated and tested by Matlab/Simulink platform,the variation law of the state quantity of the capacitor under different faults are studied,the relationship between the change of the state quantity and the fault is summarized and the fault locating method of power capacitor based on differential idea is proposed so to achieve fast identification and location of the fault and instruct the draw-up of the maintenance plan.%本文针对电力电容器故障特点及离线试验存在的弊端,提出了基于运行电压、电容量、不平衡信号等参数作为状态监测量的故障诊断方法,结合相关规程标准设计了故障判别及其预警方案.利用Matlab/Simulink平台对电力电容器内部故障进行了仿真试验,研究了不同故障下电容器各状态量的变化规律,归纳总结了状态量变化与故障之间的关系,提出了基于差分思想的电力电容器故障定位方法,实现了故障的快速判别与定位,有效指导检修计划的制定.
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