Research On Anti-tripping Technology Of Coal Mine Power Supply System

The safe power supply of coal mine directly affects the safe and efficient production of coal mine,and the basis of safe power supply is to have a perfect and reliable protection device.At present,the coal mine power supply system generally exists problems such as loss of voltage protection zero time delay,speed break overcurrent protection fixed value can not be set,which will lead to overcurrent,leakage,short circuit and other problems in the power supply system,especially leaping trip,which seriously affects the safety of coal mine power supply.Therefore,the construction of the anti-leaping trip protection system is an important means to ensure the safety of coal mine power supply and production,and to ensure the life safety of workers.This thesis analyses the causes of the great trip,on the basis of the study time differential technology,optical fiber current differential above the tripping protection and crossing fault recognition based on chicago-brewed GOOSE above three kinds of methods to deal with trip,through simulation and experiment analysis,combined with the actual data validation,above determine the safety and reliability of system solutions.This thesis analyzes the coal mine power supply characteristics and adapt to regional integration type coal mine coal mine power grid architecture of intelligent power supply system,based on the system are studied under the system of crossing the fault identification and isolation scheme,the fault and normal operation of the recognition algorithm,fault isolation algorithms,and presents a system failure cases through fault selective isolation method,emphatically analyzed based on the above chicago-brewed GOOSE communication technology of the trip in Huayang coal technology application,and Combine the integration of new energy into the coal mine power grid under the background of "dual carbon",and take distributed power sources as an example,the impact of DG access on coal mine power grid protection is analyzed.MATLAB platform is used to verify the correctness of the theoretical analysis with an example simulation.