翁利国
WENG Li-guo(Xiaoshan Power Supply Bureau

• 1:萧山供电局

摘要(Abstract)：

分析了220kV变电站常用母差保护存在保护死区的原因。结合GIS设备一般在断路器两侧同时安装电流互感器的特点,提出了母差保护接线的改进方案,有效防止在保护死区内发生故障时引起的全站失电,以及母联电流回路断线时引起的保护选择性失去,从而提高了供电可靠性。
The paper analyzes the reasons for the protection dead zone of common busbar in the 220 kV substation,and proposes the improvement scheme for busbar differential protection connection according to the characteristic of gas insulated switchgear(GIS) equipment for which the current transformers are generally installed on both sides of the breaker in order to prevent power blackout due to the fault in protection dead zone,and the selective loss of protection because of broken bus tie current loop.And the reliability of power supply can also be improved.

关键词(KeyWords)： GIS设备;母差保护;死区;接线方式;改进
GIS equipment;busbar differential protection;dead zone;mode of connection;improvement

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作者(Author): 翁利国
WENG Li-guo(Xiaoshan Power Supply Bureau

DOI: 10.19585/j.zjdl.2011.02.007

参考文献(References)：

• [1]天津大学.电力系统继电保护原理(第3版)[M].北京:中国电力出版社,2000.