500kV变电站更换母差保护后的回路改造方案探讨

500 kV变电站承担着重要的供电任务,一般不允许母差保护长时间退出运行.母差保护由于涉及间隔多、回路复杂,如何解决在母差保护数字化改造过程中已改造间隔的数字化保护和未改造间隔的常规保护之间的配合是个难点问题.通过合理组合母差保护、调整一次接线等方法,提出了3种不同的改造方案,对方案的优缺点和适用性进行了比较.

Discussion on Circuit Retrofit Scheme After Replacement of Bus Differential Protection in 500 kV Substations

Bus differential protection is generally not allowed to exit the operation in the 500 kV substations,which undertake the important task of supplying power.As bus differential protection involves many intervals and complex circuits,it is difficult to seek a solution to the problem of cooperation between digital protection with improved interval and conventional protection with unimproved interval during digital retrofit of bus differential protection.This paper puts forward three different retrofit schemes after reasonable combination of bus differential protection,adjustment of primary connection etc.and compares their advantages and disadvantages as well as applicability.