牵引变压器低电压启动过电流保护的试验及分析

Test and Analysis of Low Voltage Starting Overcurrent Protection for Traction Transformer

通过日常维护中的试验对牵引变压器保护装置的性能进行验证,对维护变压器的可靠运行有着举足轻重的作用。本文在阐述牵引变压器低电压启动过电流保护的基本工作原理的基础上,详细介绍了此种保护电压、电流参数的形成回路,探讨了低电压启动过电流保护的保护功能试验时虚拟电量测试范围、步长、时间变量步长的计算方法,并通过实验验证了此方法下试验的可靠性和准确率。

The performance of traction transformer protection device is verified through the daily maintenance test,which plays a pivotal role in maintaining the reliable operation of the main transformer.Based on the basic working principle of low voltage start overcurrent protection of traction transformer,this paper introduces the formation circuit of such protection voltage and current parameters in detail,and discusses the calculation method of virtual power test range,step size and time variable step size during the protection function test of low voltage start overcurrent protection.The reliability and accuracy of this method are verified by experiments.