一种适用于中低压短线路的光纤纵差保护方案

Application research of optical fiber differential protection used in medium-low voltage shorter transmission line

分析了中低压短线路纵差保护的现状,对电流综合量继电器与普通电流继电器在各种短路情况下的灵敏度比较,复式比率差动继电器与常规比率差动继电器在各种短路电流情况下的动作性能比较等进行了研究。提出了一种适用于中低压短线路的复式比率电流综合量差动保护原理方案。此方案可提高保护的灵敏度,同时为光纤纵差保护采用异步通信方式提供可能,达到降低保护装置成本的目的。

This paper first reviews and analyzes the status of differential protection used in shorter transmission line, studying asynchronous communication for optical fiber differential protection, comparing sensitivity of complex current relay to common current relay under different fault types, analyzing characteristic of compound differential relay to traditional differential relay under different short circuit current. Then, it represents the compound differential protection scheme used in complex current, which applied to shorter transmission line in middle or lower voltage power system. This scheme can improve sensitivity of protection, and make it possible to asynchronous communication for optical fiber differential protection, and reduce cost of protection set.