摘要
针对谐振接地系统经高阻接地时,故障特征信息微弱易导致选线失败问题,提出一种调谐式故障选线方法。详细分析了故障后系统零序电流特征及所提选线方案的抗过渡电阻能力,通过调节脱谐度改变线路零序电流特征,发现故障线路与健全线路零序电流变化方向相反且变化率差异显著。利用故障线路与健全线路的零序电流变化特征差异,构建了调谐式故障选线方法。仿真计算结果表明,该方法准确可靠,高阻接地下可以有效识别故障线路,进一步提高选线准确率。
In view of failure of line selection due to weak fault characteristic information when then resonant grounding system is grounded through high resistance,a kind of tuning method in fault line selection is proposed. The zero sequence current feature of the system and anti-transition resistance ability of the proposed line selection proposal after the fault are analyzed in detail. It is found through adjusting detuning degree to change the zero-sequence current characteristics of the line that the zero sequence current variation direction for the faultand healthy line is opposite and the variation difference is obvious. The tuned fault line selection method is constructed by using the difference between the zero-sequence current variation characteristics of the fault line and the healthy line. It is shown by the simulation result that the method is accurate and reliable and,under high-resistance grounding,can identify the fault line as well as improvethe accuracy of line selection further.
作者
白杰
邵文权
程远
张志华
BAI Jie;SHAO Wenquan;CHENG Yuan;ZHANG Zhihua(Department of Electronic and Information, Xi’an Polytechnic University, Xi’an 710048,China;State Grid Shaanxi Power Company Electric Power Research Institute, Xi’an 710054, China)
出处
《电力电容器与无功补偿》
北大核心
2019年第3期143-147,共5页
Power Capacitor & Reactive Power Compensation
关键词
谐振接地系统
高阻接地
调谐式
故障选线
resonant grounding system
high resistance grounding
tuning mode
fault line selection
