Single Phase to Earth Fault Location Method in Distribution Network Based on Signal Injection Principle
A single phase to earth fault location method in distribution network based on signal injection principle is proposed. It is expected to solve single phase to earth fault location problem in neutral indirectly earth system.When single phase to earth fault occurs,a sine current signal with constant frequency is injected into the fault phase from potential transformers secondary side,the injected signal current and its voltage drop on the fault line can be measured through the fault lines zero sequence current transformer (CT) and potential transformer (PT) on the bus.Based on distributed parameter model of distribution line,we can get the relational expressions between injected signal voltage and current at measuring point and fault point,then,we can solve the fault distance by using the resistive characteristic of transition resistance.This method is not affected by system structure and operating mode,and the use of distributed parameter line model eliminating the impact of distributed capacitance,the result of fault distance has high precision.Simulation results verify the correctness and feasibility of the proposed method.
injected signal:distribution line:single phase to earth fault:distributed parameter:fault location
BAI Yong CONG Wei LI Jiansheng DING Lei LU Qingdong YANG Ning
School of Electrical Engineering Shandong University Jinan,China Shandong Electric Power Corporation Jinan,China
国际会议
威海
英文
204-208
2011-07-06（万方平台首次上网日期，不代表论文的发表时间）