Application and Improvement of RCS/PCS Type Fiber Optic Current Differential Protection Joint Trip Function

After an in-depth investigation of a 220kV line trip event that occurred in a 220kV conventional substation, the reason behind it was the improper logic of the 220kV line longitudinal differential protection action. Taking the RCS/PCS optical fiber current differential protection device in the tripping event as an example, the behavior of the 220kV line longitudinal differential protection action and joint tripping action is analyzed, and the logical defects of the joint debugging logic in operation are proposed. The technical method for correct improvement was established, and combined with this trip event, some reasonable suggestions and measures were put forward according to the operation mode and maintenance process.