变压器比率制动差动保护制动系数校验方法研究

Checkout Method of Restraint Coefficient for Transformer Ratio Restraint Differential Protection

根据不同微机继电保护装置的不同规定和说明,以动作逼近思想为基础,研究了校验变压器比率制动差动保护制动系数的两种方法:方法一,保持低压侧电流输入量不变,增大高压侧电流输入量;方法二,保持高压侧电流输入量不变,减小低压侧电流输入量。经比较得出,采用低压侧电流输入不变而增大高压侧电流输入的方法一能够减小制动系数的校验误差,对智能电站主变差动保护的整定计算具有参考价值,对主变继电保护参数的校验具有指导意义,具有较好的实际工程应用性。

According to different regulations and instructions of different microcomputer relay protection devices,two approaches of checking restraint coefficient for transformer ratio restraint differential protection are studied based on action-approaching concept.One method is to increase the input of current of the high voltage side with the current of the low voltage side unchanged.On the contrary,the other method is to decrease the input of current of the low voltage side with the current of the high voltage side unchanged.After comparison,it is concluded that the former method contributes to smaller checkout error of restraint coefficient.This method is of reference value to the setting calculation of main transformer differential protection for smart substation,of instructive meaning to parameter checkout of the main transformer relay protection and good application value to practical engineering.