摘　要：对于发变组失灵保护,目前还存在模糊认识和错误认识,影响到保护的可靠性.通过对"转子两点接地"等保护量动作结果的分析,说明有些保护量没有能力启动失灵,需借助"程跳逆功率"保护启动失灵,但"程跳逆功率"保护的逻辑回路宜修改;通过对"失磁"等保护量动作结果及其保护目的分析,说明有些保护不需启动失灵.在电流判别方面,从失磁和逆功率2种情况分析,可得出其整定计算原则;在电压判别方面,规程规定的复合电压闭锁会造成失灵拒动,有2种方案可供改进.改进后的失灵保护逻辑加上明确的电流判别整定计算原则,将使发变组失灵保护更加完善可靠.
关键词：失灵保护;发变组保护;电流判别;电压判别
分类号：TM772　文献标识码：A
文章编号：1004-9649(2007)02-0089-04

Analysis and improvement of breaker failure protection for generator-transformer unit

GUO Bin　

作者简介：郭斌(1970-),男,广东汕头人,高级工程师,硕士研究生,从事发电厂生产管理.E-mail:gzguobin@163.com
作者单位：郭斌（华南理工大学,电力学院,广东,广州,510640;广州恒运集团公司,广东,广州,510730）　

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