摘要
针对煤矿电网受消弧线圈的补偿,在发生单相接地故障时,存在故障信息微弱,难以辨别的问题,提出了一种基于瞬时正序电流特征的煤矿电网故障区段定位方法。利用故障点异侧的暂态正序实部电流信号距离值较大,故障点同侧的信号距离值较小的特点,依次对分支节点处的信号距离值进行比较,节点处距离值最小的对应故障分支,从而确定故障路径,故障路径上各区段中信号距离值最大的即对应故障区段。经大量仿真验证表明,定位方法在不同故障条件下均能有效区分故障区段,具有一定适用性。
Aiming at the compensation of the arc suppression coil of the coal mine power grid,when a single-phase ground fault occurs,the fault information is too to be distinguished,so a method is proposed for locating fault sections in coal mine power grids based on instantaneous positive sequence current characteristics.According to the fact that the current signal distance value of the transient positive sequence real part on the different side of the fault point is larger,and the signal distance value on the same side of the fault point is smaller,the signal distance value at the branch node is compared in turn,the fault branch has the smallest distance,so the fault path is determined.And the fault signal has the largest signal distance in each section on the fault path,so the fault section is determined.A large number of simulations show that the positioning method is effective in fault section distinguishing under different fault conditions and is applicable in certain conditions.
作者
杨勇
冯泽镡
赵建文
李升健
YANG Yong;FENG Ze-xin;ZHAO Jian-wen;LI Sheng-jian(School of Electrical and Control Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;State Grid Jiangxi Electric Power Research Institute,Nanchang 330096,China)
出处
《煤炭工程》
北大核心
2021年第3期156-160,共5页
Coal Engineering
基金
陕西省工业科技攻关项目(2015GY049)
西安市科技计划项目(GXYD13.10)。
关键词
煤矿电网
单相接地故障
故障区段定位
正序电流
信号距离
coal mine power grid
single-phase grounding fault
fault segment location
positive sequence current
signal distance
