摘要
针对变压器比率差动保护现场测试的传统方法存在一些不足之处,笔者根据测试比率差动保护的根本目的,分析和指出比率差动保护动作特性曲线的物理意义,并据此将动作特性曲线上每一点对应的差动电流视为保护的一个"整定值",提出突然给保护装置施加试验电流以测试比率差动保护的方法。该方法依据保护的制动电流计算式、动作方程和特性曲线等资料列出方程组,进而求出所需的试验电流。最后通过实例介绍文中所提方法的具体实施步骤,证明该方法与传统测试法相比,效率更高,更为安全和严谨。
In view of the shortcomings of the traditional method for field test of transformer ratio differential protection,according to the fundamental purpose of testing ratio differential protection,the physical meaning of the action characteristic curve of ratio differential protection is analyzed and pointed out,and according to this,the differential current corresponding to each point in the action characteristic curve is regarded as a"setting value"of the protection,and the method of suddenly applying the test current to the protection device to test the ratio differential protection is proposed.This method lists the equations according to the calculation formula of braking current,action equation and characteristic curve of the protection,and then obtains the required test current.Finally,the specific implementation steps of the proposed method are introduced with an example,which proves that this method is more efficient,safe and rigorous than the traditional test method.
作者
潘光贵
PAN Guanggui(Guangxi Electrical Polytechnic Institute,Nanning,Guangxi,530007)
出处
《红水河》
2021年第4期108-112,共5页
Hongshui River
关键词
电流突变
变压器
比率差动保护
测试
动作特性曲线
current mutation
transformer
ratio differential protection
test
action characteristic curve
