斗山站主变500kV开关无短线保护解决方案

The Solution Scheme of 500 KV Side Switches of Main Transformers without Short-lead Wire Protection in Doushan Substation

500 kV斗山站220 kV系统全停改造时,站内的1号、2号主变500 kV侧2只开关之间没有短引线保护,一旦发生故障必然是死区故障。讨论了2种增加短引线保护方案的优缺点,认证后决定采取方案二即修改主变差动保护的外部回路和内部逻辑,满足短引线保护的要求。

When the 220 KV system is fully cut-off during renovation,there is no short-lead wire protection between two side switches of N0.1 No.2 main transformers in 500KV Doushan substation.Therefore,a dead zone fault must be caused if something wrong happened to this substation.In this thesis,we decided to choose a scheme that is ＂To satisfy requirements of short-lead wire protection by updating external circuit and internal logic of main transformers＇ differential protection＂ after serious discussion of two additions of short-lead wire protections.The scheme is proven to satisfy the requirements of short-lead wire protection.