电压回路异常的快速检查处理方法

A method for quick locating the defects in voltage circuit

分析变电站电压回路异常的常见故障类型,总结出了快速查找电压回路异常故障原因的方法,通过分析电压数据特征可快速判断出故障点。其中线电压是否对称是PT断线与单相接地的判断标志,而零序电压有无与否是一次断线与二次断线的判断标志,接地相电压值的降低程度是系统单相接地与绝缘降低的判断标志。

This paper analyses the familiar faults of voltage circuit in substation and proposes a method for quick locating the defects of voltage circuit through analyzing the characteristic of voltage data. The unbalanced line voltage is the indication of PT disconnection and single phase to ground fault. Whether there is zero sequence current is the indication of primary and secondary disconnection. The drop magnitude of earthing phase voltage is the indication of single phase to ground fault and insulation deterioration.