摘要:继电保护的隐性故障是一种潜在故障,对电力系统的危害极大。电压互感器二次回路发生两点接地是一种典型的隐性故障,会导致微机保护的自产零序电压发生偏移,可能导致零序方向保护误动或拒动。分析了电压互感器二次回路的两点接地故障对零序方向纵联保护的影响机理,提出了电压互感器二次回路两点接地隐性故障在线、实时的识别方法;并提出一种新的解决零序方向纵联保护误动的方法。通过大量仿真实验,验证该理论分析的正确性。
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