Abstract: Based on EMTP simulation, an analysis is made on the induced voltage and induced current of the 1 000 kV AC double circuit lines on the same tower of the Huainan-Wannan-Zhebei-Shanghai transmission project with one circuit blackout. According to the service condition of grounding wires, it is found that the main causes for grounding wire burns are the excessive induced voltage on the blackout line and the repeated arc discharge during installation of the grounding wires. Under the maximum induced voltage calculated by simulation, the arc produced in the process of installing grounding wires is studied through test, and the critical value of arc energy which can have impact on the wire and equipment is obtained. The burn problem is effectively solved by introducing arc suppression technology, which guarantees the safety of maintenance personnel.