摘要
单相接地故障作为煤矿电网发生频率最高的故障类型,不仅损伤电网设备,同时极易引发火灾等事故,严重影响供电可靠性。针对上述问题,对煤矿电网接地故障及选线技术进行分析与研究,提出一种基于信息融合的单相接地故障选线方案。首先对比幅比相法及零序导纳法进行单相接地选线实验分析,得出2种方法的误差影响因素作为改进优化依据。随后采用谐波导纳累加的方法对零序导纳法进行优化,使非故障线路及故障线路的导纳角进一步远离正虚轴,从而提高故障线路与非故障线路导纳角的区别裕度,达到减小零序导纳复平面误动区域、使故障方向更为清晰、降低误判率的目的。经实验测试,该改进方案的平均选线速度≤60 ms,故障线路识别准确可靠,可有效提高煤矿电网故障选线速度、精度与可靠性,保证煤矿电网安全稳定运行。
Single-phase ground fault,as the most frequent type of fault in coal mine power grid,not only damages the power grid equipment,but also easily causes fire and other accidents,which seriously affects the reliability of power supply.Aiming at the above problems,we analyze and study the coal mine power grid grounding fault and routing technology,and propose a single-phase grounding fault routing scheme based on information fusion.Firstly,the amplitude-phase method and zero-sequence conductivity method are compared to carry out experimental analysis of single-phase grounding routing,and the error influencing factors of the two methods are derived as the basis for improvement and optimization.Subsequently,the zero-sequence admittance method is optimized by the method of harmonic admittance accumulation,so that the admittance angles of non-faulty lines and faulty lines are further away from the positive imaginary axis,thus improving the differentiation margin between faulty and non-faulty line admittance angles,and achieving the purpose of decreasing the error area of zero-sequence admittance multiplane,making the direction of the fault clearer,and decreasing the misjudgement rate.After experimental testing,the average speed of the improved scheme is≤60ms,and the fault line identification is accurate and reliable,which can effectively improve the speed,accuracy and reliability of fault line selection in coal mine power grid,and ensure the safe and stable operation of coal mine power grid.
作者
潘文强
PAN Wenqiang(Xishan Jinxing Energy Co.,Ltd.,Xigou Coal Mine,Xingxian 033602,China)
出处
《煤矿现代化》
2024年第6期108-112,共5页
Coal Mine Modernization
关键词
煤矿电网
单相接地故障
故障选线
谐波导纳
underground substation
power monitor
prevent override tripping
unattended
