摘要
因10 kV电网单相接地造成电压互感器损坏在中性点不接地系统中时有发生,通过构建单相接地故障发生时和消除后两个过渡过程等效电路,介绍单相接地对电压互感器损坏的机理,从而分析引起电压互感器发热影响因素,并进行仿真验证。结果表明:单相接地造成电压互感器发热引起故障的主要影响因素从小到大依次为:故障发生时的初始相角和剩磁及故障消失时的初始相角、线路长度。
Voltage transformer （VT） damage caused by single phase grounding of 10 kV power grid happens occasionally in neutral point ungrounded system. Therefore, this paper introduces influence mechanism of single phase grounding on VT damage by establishing equivalent circuits of two transient processes at the time of single phase grounding fault and after e- liminating the fault, so as to analyze influencing factors for causing VT heating and carry out emulation proof. Results indi- cate that main influencing factors of single phase grounding fault causing VT heating are respectively initial phase angle and remanence at the time of the fault happening, and initial phase angle and line length when the fault disappearing.
出处
《广东电力》
2016年第1期113-118,共6页
Guangdong Electric Power
关键词
单相接地
电压互感器
过渡过程
影响机理
中性点接地
single phase grounding
voltage transformer
transient process
influence mechanism
neutral point grounding
