Feasibility and method study of live working on 110 kV isolating switch

LONG Chenhai1, XIA Zengming1, GUO Hao1, ZHANG Jianjun1, YANG Miao1, AI Daode2

(1.Live Working Center of State Grid Corporation of Hunan, Changsha 410007, China;
2.Power Supply Company of State Grid Corporation of Hunan, Shaoyang 422000, China)

Abstract: Aiming at the problems that the existing solution of replace the 110 kV substation isolating switch was to use a power outage overhaul, which was complex and waste of time, results in the decrease of the power supply reliability, the method of live working on the 110 kV isolating switch was researched, and the new technical was proposed. The feasibility of the method was demonstrated by using ATPEMTP software to simulate the operation process and a set of shunt wire insulation lifting device was developed. The current on the isolating switch was transfered by setting up temporary short shunt circuit and leading wire. Live repalcement of isolating switch was accomplished by separation drainage line and isolating switch. The results indicate that the proposed method has the advantages of strong applicability and convenient operation. The experiments show that the shunt wire insulation lifting device is reliable in operation and this project has considerable economic and social benefits, suitable for the promotion of the country.

Key words: feasibility study; 110 kV substation isolating switch; leading wire; safety distance; economic benefits