电容器组不平衡保护动作原因分析

Analysis of capacitor unbalance protection action

针对电容器组不平衡保护占总故障次数较高这一问题，本文从不平衡电压产生原因、不平衡保护动作后故障查找等方面进行了分析，并进行了实例举证，分析出不平衡电压的产生原因有：电容器组三相电容量不平衡；电网电压三相不对称平衡；三相放电线圈性能差异等，同时提出了不平衡保护动作后的故障查找办法：接头发热；合闸时不平衡电压和时间配合不好；电容器与电抗器配合不良；电容器三相电容量不平衡或放电线圈变比不一致等，为处理电容器组故障提供了指导依据。

In view of capacitor unbalance protection of the total number of failure is higher this problem, cause, this paper from the unbalanCed voltage unbalance protection action of fault were analyzed, and the examples of proof, analyze the unbalanced voltage causes are： capacitor phase capacitance unbalance of three-phase grid voltage; asymmetrical balance; three-phase discharge coil performance differences, and puts forward the troubleshooting measures unbalance protection action： Joint heating; phase unbalance voltage and time with bad; capacitor and reactor with the poor; capacitor phase capacitance unbalance or discharge coil ratio is not consistent, and provides guiding basis for treatment of capacitor faults.