电压互感器二次单相接地短路故障分析
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control(2010)
Abstract
针对电压互感器二次单相接地短路导致非故障相电压升高的情况,通过对电压二次电缆阻抗的测试,电压互感器接地点的改变等试验。分析、阐述了其产生的原因是二次电缆N相线芯阻抗在短路电流流过时产生电压叠加在非故障相线芯上所致。可采取增大N相线芯截面积或退出过电压保护等措施预防其对电网的不利影响。
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Key words
Analysis,Preventive measures,Secondary phase-to-earth short circuit fault,Voltage transformer
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