CAJ | 학술논문

高压输电线路发生高阻接地故障时,由于受过渡电阻的影响,线路保护动作行为较为复杂,故障测距结果往往误差过大.针对以上问题,提出了一种高阻接地故障辨识和故障定位的方法.该方法的核心思想是基于故障录波数据,计算故障区域各条线路两侧电流矢量和及跳闸线路两侧零序电流比值,然后根据序网络故障分析和差动保护原理,利用电网分布式继电保护计算系统进行故障辨识和定位.计算和现场巡线结果表明该方法受过渡电阻和负荷电流的影响很小,故障定位精度较高,可满足现场的应用要求.
고압수전선로발생고조접지고장시,유우수과도전조적영향,선로보호동작행위교위복잡,고장측거결과왕왕오차과대.침대이상문제,제출료일충고조접지고장변식화고장정위적방법.해방법적핵심사상시기우고장록파수거,계산고장구역각조선로량측전류시량화급도갑선로량측령서전류비치,연후근거서망락고장분석화차동보호원리,이용전망분포식계전보호계산계통진행고장변식화정위.계산화현장순선결과표명해방법수과도전조화부하전류적영향흔소,고장정위정도교고,가만족현장적응용요구.
Due to the existence of transition resistance, protection action behavior is complicated and the fault location results are often inaccurate when a high-resistance grounding fault occurs in HV transmission lines. To solve the above problems, a high-resistance grounding fault identification and fault location method is proposed. The core idea of this algorithm is to analyze the current vector of every line in fault zone and zero-sequence current ratio of the trip line based on the fault records. According to the sequence network fault analysis and differential protection principles, grid relay protection distributed calculation system is used to identify and locate the faults. Fault calculation and line inspection results show that the proposed method is slightly affected by transition resistance and load currents, their fault location results are accurate for high-resistance grounding fault, thus the method can meet the requirement of on-site application.