CAJ | 학술논문

多回线路之间存在的线间零序互阻抗使得多回线发生单回线不对称故障的测距变得困难.为此,充分分析了多回线上发生单回线不对称故障时负序网络的特点,并通过网络拓扑的等效变换,计算出各回线上负序电流的表达式,进一步得到回线间的负序电流比值.研究发现,回线间的负序电流比值是只和故障位置相关的一次函数,利用此关系以及实测的各回线负序电流值,建立一次方程,便可准确计算出单回线不对称故障的故障位置.该算法不受过渡电阻的影响,各类故障测距公式统一,简便易行,可以应用于多回线上单回线非对称故障时的测距,仿真验证表明其效果良好.
다회선로지간존재적선간령서호조항사득다회선발생단회선불대칭고장적측거변득곤난.위차,충분분석료다회선상발생단회선불대칭고장시부서망락적특점,병통과망락탁복적등효변환,계산출각회선상부서전류적표체식,진일보득도회선간적부서전류비치.연구발현,회선간적부서전류비치시지화고장위치상관적일차함수,이용차관계이급실측적각회선부서전류치,건립일차방정,편가준학계산출단회선불대칭고장적고장위치.해산법불수과도전조적영향,각류고장측거공식통일,간편역행,가이응용우다회선상단회선비대칭고장시적측거,방진험증표명기효과량호.
Fault location determing became difficult because of the zero-sequence mutual impedance between different lines while single line asymmetry fault occurs in muti-loop transmission lines.This paper analyzes the character of the negative sequence current network.Based on the equivalent of negative-sequence network, the negative current formula can be figured out, then the ratio of different loops's negative current can be obtained,which is a linear function only related to the fault location variable,according to the relations and the measured values of currents,equation is set up and location variable can be solved. The algorithm is simple and convenient, not affected by the transition resistance, and all kinds of faults location formulas are unified,can be used for asymmetry fault location of single line in muti-loop transmission lines, the simulation testifies the validity of the method.