辽宁省参窝电厂主变压器差动保护接线改进

Improvement of the Differential Protection Link of Main Transformer at Shenwo Electric Power Plant

辽宁省参窝电厂主变压器差动保护采用ＬＣＤ—１５型具有比例制动特性的继电器构成，用ＦＬ—８型交流器平衡由于主变高低侧电流互感器受比不同而产生的差电流，本文论述了在差动保护区外短路时，差动保护能可靠制动；而在差动保护区内短路时能可靠动作的原理接线，使主变差动保护具有选择性。

This paper discusses the link principle of different protection that can reliablly act when short circuit happens in or out of different protecting area.This different protection makes main transformer protection possess selectivity.