Solution Scheme for Over Tripping Problem of Power Supply at Coal Mine

The over tripping phenomenon influences mine safety production.The intelligent terminal is installed in every mining area with high-voltage proof switch substation,which realizes analog volume(including amount of current,voltage,capacity,and opening into the volume) digital.The high-speed optical fiber communication and synchronous sampling technology are applied.The precise synchronous sampling of data is sent to the control room located in the protection room to do logical calculation.When protection action works,the protection main computer sends out command to intelligent terminal by fiber net,which protects the over tripping.This protection system gains good effect by practical operation at Changcun coal mine.