摘要
为了抑制铁磁谐振,小电流接地系统中电压互感器通常采用4TV接线方式,但由于此接线方式较为复杂,极易出现接线错误,尤其是当零序TV二次绕组极性接反时,会给现场运行检修人员分析故障带来困难,甚至会造成误判。调研了4TV接线方式在绍兴地区的应用现状后,提出了一种"理论分析+实验设计"的极性判别方法,深入分析了4TV接线在系统发生单相接地故障时各点电压的变化情况,通过试验设计并模拟故障得到试验数据,并通过理论数据和试验数据的比对验证了该试验设计的合理性,为判别4TV接线方式是否正确提供了一种有效的检验方法。
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.
出处
《浙江电力》
2016年第1期27-30,69,共5页
Zhejiang Electric Power
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
small current grounding system
voltage transformer
wiring polarity determination
fault analy-sis
test method
