In order to get the quick response and right judgement of any accident, G-High Equipment Department carried out the circuit fault repair drill on Apr.25,2021. Through the on-site analysis of the fault points, detailed repair plan was formulated, and deviation was corrected in the repair process to ensure the stable power consumption during the production of carburizer. These actions effectively improved the ability to repair electricity quickly, and the electricians accumulated rich experience in dealing with circuit faults.