摘要
Abstract
In order to suppress ferromagnetic resonance, 4TV connection mode is usually adopted in voltage transformer of small current grounding system. However, the connection mode is complex and is prone to wrong wiring; especially when secondary winding polarities of zero-sequence TV are reversely connected, it may bring difficulties to filed operation and maintenance personnel in fault analysis or even wrong judgment. After investigating present application of 4TV wiring mode in Shaoxing, the paper puts forward a polarity determi-nation method of "theoretical analysis+experimental design" and deeply analyzes the voltage changes of 4TV wiring when single-phase grounding fault occurs in the system. Through the experimental design and fault sim-ulation, test data is obtained;through comparison between theoretical data and test data, rationality of the ex-periment design is validated, which provides an effective method to determine correctness of 4TV wiring mode.关键词
小电流接地系统/电压互感器/接线极性判别/故障分析/试验方法Key words
small current grounding system/voltage transformer/wiring polarity determination/fault analy-sis/test method分类
信息技术与安全科学
