变压器纵差动保护调试分析

华能白山煤矸石电厂起动备用变压器连接组别为Dy1,但其所用的国电南自成套保护装置DGT801C只有两种连接组别△-11与△-1可以设置.而且,微机保护中变压器纵差动保护的单相调试和三相调试在平衡检查上有所不同,给现场调试带来了一定的困难.为了解决这些问题,研究了变压器纵差动保护软件移相原理和平衡系数,分析了单相和三相调试的区别,并给出了正确的调试方法,保障了调试的顺利进行.

Analysis of transformer longitudinal differential protection debugging

In Huaneng Baishan Gangue Power Plant, the connection group of reserve transformer is Dyl, with the protection set DGT801C, manufactured by Guodian Nanjing Automation Co. , Ltd. , which has only two connection groups △-11 and △-1. Besides, there is difference in balanced detection, which will bring difficulty in on-site debugging , between single-phase and three-phase debugging of transformer longitudinal differential protection in micro- computer protection. So as to solve these problems, this paper studies the phase-shifting principle and equilibrium coefficient of transformer differential protection software, analyzes the differences between single-phase and threephase debugging, and proposes correct method which guarantees the success of debugging.