某抽水蓄能电站主变压器低压闭锁过流保护动作原因分析及改造方案

本文对某抽水蓄能电站主变压器复合低压闭锁过流保护动作原因进行了详细的分析.该保护装置采取冗余配置,两套保护装置中复合低压闭锁过流保护采用的电压量为主变压器高压侧同一电压互感器的不同绕组,针对本次保护动作暴露的缺陷,通过对比两套保护装置采集到的电压量是否同时消失,判别是否对该保护出口进行闭锁,从而使该保护动作的正确率进一...

Analysis on the Cause of Overcurrent Protection Action of Low-voltage Lockout in a Main Transformer of Pumped-storage Hydroelectricity and Its Improvement Scheme

In this paper,a detailed analysis of the main transformer of a pumped storage power station compound low voltage block overcurrent protection action reasons.The protection device to take redundant configuration,two sets of protective device in the composite low voltage lockout overcurrent protection mainly voltage transformer high voltage side of the same different winding of voltage transformer,the purpose of this article is aimed at the protection action exposed defects,by comparing the two sets of protective device to voltage whether disappear at the same time,judging whether the protection of export is blocking,so that the accuracy of protection operation to further improve,finally realizes the protection of the main transformer and the unit PT disconnection functions are perfect.Make the protection work correctly when the primary wiring voltage of the high voltage side is reduced and the overcurrent condition is met,rather than work wrongly when the secondary circuit of the voltage transformer is disconnected and the overcurrent condition is met.