一起由于电流回路开路导致的保护动作分析

The Analysis of the Relay Operation Due to the Opened Current Circuit

电流差动保护在元件保护中得到了极其广泛的应用,电流回路的正确性对差动保护正确动作有着至关重要。本文从系统中发生的一次由于电流回路开路导致500kV主变跳闸的事故出发,详细地从理论上分析了差动保护的动作原因,并提出了预防该类事故发生的具体措施和办法。

Current differential relay is widely used in element protection. It is very important to ensure the current circuit in correct status for the current differential relay. From a accident that current open circuit results in the trip of the 500kV transformer, this paper carefully analyzes the reason of operation of the current differential relay and proposes technical ways to prevent such accident.