Study on Bypassing Trip for Electric Power Supply System in Coal Mine

In the bypassing trip of the mine power supply system, the percentage of the sudden occurred bypassing trips due to the voltage wave, electric disturban es, protection, poor switch performances and other causes would be higher than the bypassing trips occurred by the short circuit overcurrent.The bypassing trip could not be fully solved only from the short circuit protection.Therefore the paper proposed that the solution of the bypassing trip should be based on the measures made fro m the technology, equipment, environment, management and other aspects.The solution of the bypassing trip of the mine power supply system has been applied to the trials in the Xishan Coal and Electric Power Group, Yima Coal Group and others.The site applications showed that the solution could prevent the bypassing trip protecti on of the mine power supply system, could solve the bypassing problem occurred by the different causes and could have a full monitoring and control of the mine power supply system.