极化电流行波方向继电器

电容式电压互感器不能有效传变宽频带的电压故障行波信号,使得传统利用电压故障行波构成行波方向继电器的保护算法不能应用于实际电力系统保护中,为此提出了一种极化电流行波方向继电器。该方向继电器以电压故障行波中工频分量初始极性与电流故障初始行波的波头极性相比较判定故障方向,解决了传统行波方向继电器因不能有效获取宽频带电压故障行...

Polarized Current Travelling-wave Based Directional Relay

Capacitor voltage transformer cannot transmit wide frequency band voltage fault travelling-waves effectively,so that traditional voltage fault travelling-wave based directional relay cannot be applied to power system protections.Then a polarized current travelling-wave based directional relay(PCTDR) for transmission lines is put forward.This directional relay judges the fault direction by comparing the initial polarity of fundamental frequency components in voltage fault transient travelling-waves with the wave front polarity of current fault initial travelling-wave.This method resolves the problems that the traditional travelling-wave directional relay cannot be utilized in power system because capacitor voltage transformer cannot transmit wide frequency band voltage travelling-waves effectively.The basic principle and protection algorithm of PCTDR are presented.Simulation model of a 750 kV transmission system has been constructed with alternative transient program(ATP).Simulation results verify that PCTDR has good operation performance because it has fast operation speed and is immune to fault types,fault distance,fault path resistance and current transformer saturation. This work is supported by the National Natural Science Foundation of China(No.50937003,No.51007045),the Foundation of State Key Lab of Power Systems of China(No.SKLD09M04),National Key Technology Research and Development Program of China(No.2006BAJ16B02),and Specialized Research Fund for the Doctoral Program of Higher Education of China(No.200800031034).