Design and Application of Relay Protection Communication Channel Based on 2M Optical/Electrical Interface of SDH System

Aiming at the current situation and problems of the existing relay protection communication channel,a relay protection communication channel based on 2M optical/electrical interface of SDH system is designed,it is mainly applied to the new line between the new substation and the old substation, and the existing optical transmission equipment in the old station has been discontinued, and the matching 2M optical interface board has been unable to purchase the line protection channel, and has been successfully applied to the new line project of the State Grid East Inner Mongolia Electric Power Supply Company. The functional indicators of the application system are tested, and the test and application results show that the channel can save a lot of communication facilities resources, effectively reduce the burden of operation and maintenance work after putting into operation, save investment and construction period, and be more economical,and can meet the needs of power grid production in terms of Safety and stability and reliability,can bring many benefits to relay protection system construction,operation maintenance.