CAJ | 학술논문

提出了一种适用于T接线路的基于故障分量综合阻抗的纵联保护新原理,利用故障时线路三端电压故障分量相量之和与电流故障分量相量之和的比值来判断线路上是否发生了故障.外部故障时,该比值反映线路的容抗,其模值较大;内部故障时,该比值反映系统电源阻抗和线路阻抗,其模值相对较小,据此可以区分线路上的内部和外部故障.根据新原理构成的保护不需要对电容电流进行补偿,可用于带或不带电抗器补偿的线路,在原理上不受过渡电阻的影响,而且当T接线路内部发生故障而有汲出电流时,保护的灵敏度也不受影响.EMTP仿真验证了新原理的有效性.
제출료일충괄용우T접선로적기우고장분량종합조항적종련보호신원리,이용고장시선로삼단전압고장분량상량지화여전류고장분량상량지화적비치래판단선로상시부발생료고장.외부고장시,해비치반영선로적용항,기모치교대;내부고장시,해비치반영계통전원조항화선로조항,기모치상대교소,거차가이구분선로상적내부화외부고장.근거신원리구성적보호불수요대전용전류진행보상,가용우대혹불대전항기보상적선로,재원리상불수과도전조적영향,이차당T접선로내부발생고장이유급출전류시,보호적령민도야불수영향.EMTP방진험증료신원리적유효성.
A new pilot protection principle based on fault component comprehensive impedance is proposed for T-type transmission line,which uses the ratio of the sum of three terminal component voltage phasors to the sum of three terminal current phasors of the same line to detect the line fault.When an external fault occurs,the ratio is large,reflecting the capacitive impedance of line;when an internal fault occurs,the ratio is relatively small,reflecting the impedance of both system source and line,by which the external fault is distinguished from internal one.The protection with this new principle needs not to compensate the capacitive current,suitable for line with or without shunt reactor.It is not influenced by the transition resistance and its sensitivity is not influenced by the out-flowing current during the internal fault of the T-type line.Simulation with EMTP verifies its effectiveness.This project is supported by the National Natural Science Foundation of China(50677051,50877061) and Research Fund for the Doctoral Program of Higher Education of China(20070698057).