不完整串扩建中二分之三断路器接线二次回路变更分析

Analysis of the Secondary Circuit Change during Extension of Incomplete String in 3/2 Connection Mode

针对500 kV变电站工程建设中线路保护、断路器保护接线较复杂和施工危险点较多的问题,结合某500kV变电站扩建工程,根据二分之三断路器接线方式下变电站二次回路的设计特点,对不完整串扩建时二次回路(包括电流回路、线路保护、断路器保护和单元电气闭锁)的变更情况及危险点进行分析,并提出扩建改造中危险点控制措施。

Aiming at complex wiring of line protection and breaker protection as well as danger points in construction of 500 kV substation, the paper analyzes change of secondary circuit （including current circuit, line protection, breaker protection and unit electrical locking） change during extension of incomplete string and it presents countermeasures against danger points in extension.