500 kV丰进线复用载波机接口改造

Transformation of interface with multiplex power line carrier in Fengcheng-Jinxian 500 kV transmission line

通过对一起500kV线路重合闸不成功事例进行分析,发现其保护回路及保护与载波机接口命令配置存在问题,保护接口设备传输分相式线路保护命令和直跳命令时,优先传输直跳命令,两种命令不能同时传输。针对其发生的原因提出并实施了改进和预防的措施,增加了一套保护接口设备单独传输直跳命令,改造后经测试保护动作正确,取得较好的效果,为在其他电厂出现类似故障时提供借鉴和参考。

By analyzing an unsuccessfully reclosing of 500 kV power line ,t his paper finds configuration problems on the protection circuit and power line carrier-computer interface command.When protective interface equipment transports phase line protection command and direct tripping command, i t gives priority to a direct tripping command ,s o two kinds of commands can not be transmitted simultaneously.On the reasons for its occurrence ,i t proposes and implements improvements and preventive measures, a nd adds a protective interface equipment to transmit direct tripping command separately. After retrofit and test, the protect action is right,and the result is better, which provides a reference for other power plants when encounters a similar situation.