부산대학교 도서관

In order to determine the influence degree of ground wire insulation design on the lightning induction capability and shielding ability of overhead ground wire and the lightning withstand level of 500kV transmission lines, a comprehensive study of lightning process theory calculation, equivalent experimental analysis and electromagnetic transient simulation calculations of lightning strikes is carried out. It analyzes the changes in the lightning attraction capability of the ground wire and the lightning withstand level of the transmission lines after the insulation design of the ground wire (grounded through small gaps) compared to the conditions where the ground wire is grounded at each tower. The impact of insulated OPGW on the lightning performance of the line was determined, refining the methods and principles for the coordinated design of insulated ground wires. Research shows that the accumulation time of induced charge on the overhead insulated ground wire is significantly shorter than the time required for the development of thundercloud leaders, and the different grounding modes of overhead ground wire do not affect the initiation and progression of the lightning leader and have minimal impact on the lightning performance of 500kV transmission lines.