发电厂公用段母线级联保护配置方案探析

Scheme of Cascade Protection Configuration for Common Section Bus in Power Plant

电厂的中压母线保护一般靠其进线侧的过流保护根据时限的配合要求来跳闸,延时较长。一种称为"级联保护"的母线快速保护方案可以以极短延时出口跳闸,大大缩短母线故障的切除时间。文章讨论了级联保护应用在设置有公用段的发电厂厂用电接线中遇到的问题及解决方案。

Generally,the bus fault occurred in power plant MV system can only rely on over-current protection of adjacent element to cut off the fault with long delay.A fast bus protection scheme called ＂cascade protection＂ can trip in a very short time, which shortens the bus fault time significantly.This paper discussed the problems and solutions of cascading protection for MV system with common segments of power plant.