220 kV旁代主变操作引起差动保护动作分析

Analysis of Bypassing 220 kV Transformer Caused Differential Protection Action

摘要: 大兴变旁代主变过程导致差动保护动作，主变三侧开关跳闸，经短接CT电流端子模拟试验，确认为五防钥匙误碰CT电流端子，导致AB相短路，出现差流启动差动保护。本文提出加强现场防误碰措施、规范二次操作，以提高运行人员技术水平。

Abstract: The process of bypassing transformer of Daxing leads to differential protection action and transformer’s three side of switch trip. According to the simulation experiment of short circuit CT terminals, it is sure that the thing that five-prevention key falsely touches the current terminals leads to short circuit phase A and B, the appearance of differential current and the start of differential protection. The paper proposes to enhance the measure of anti false touch and specify secondary operation, in order to improve the technology level of operators.