摘要
差动保护作为变压器内部故障的主保护,是变压器保护的重中之重,零序差动保护作为变压器差动保护之一,尤其值得引起我们的重视。介绍了西门子7UT612装置的零序差动保护的基本原理、动作判据等,并结合贵广直流工程调试阶段第一次对换流变充电时零序差动保护87G误动导致充电试验失败的实例,阐述7UT612零序差动保护的特性以及在零序差动保护中性点CT极性整定过程中应该注意的问题,为日后现场调试零序差动保护提供借鉴作用。
Differential protection, the main protective function for transformer internal fault, is much significant for the protection of transformers. The restricted earth fault protection, one of the main differential protections for transformer, should be focused a great deal of attention on. This paper aims at the principle of restricted earth fault protection for converter transformer at the Zhaoqing converter station. Moreover, the setting methods of starpoint CT＇s polarity and things that call for caution are also introduced.
出处
《继电器》
CSCD
北大核心
2006年第18期62-65,78,共5页
Relay
关键词
零序差动保护
中性点CT极性
故障分析
zero-sequence differential protection
neutral point CT＇s polarity
failure analysis
