Aiming at the problem of over-grade trip of existing protection system in mine coal

a power network is built under the laboratory condition. And the system chooses industrial PC with Twin CAT software as master station

PLC controllers as slave station

and anti over-grade trip system for coal mine power system based on Ether CAT communication protocol is constructed.The master station completes the configuration of the slave station controller

and the master station achieve the anti over-grade trip function by Fault matrix algorithm by using PLC.The implementation of the anti over-grade trip function and the instantaneity of Ether CAT are investigated by simulating circuit failure of power line.The experimental results indicate that the system can judge and cut the fault quickly and accurately

and implement anti over-grade trip function

and real-time of Ether CAT communication technology meets the requirements.