1. School of Electrical Engineering Dalian University of Technology Dalian 116024 China; 2. China State Grid Dalian Power Supply Company Dalian 116092 China; 3. Shenzhen Power Supply Co.Ltd Shenzhen 518000 China
Abstract：The continuous development of the 1000kV UHV system puts forward higher requirements to the allowable value of the switching overvoltage for the transmission line. How to restrict the operation overvoltage multiple of transmission lines had already been a crucial question to be solved for the development of ultra-high voltage grid. The controlled switching technology is an important technology to solve this difficult point. However the development bottleneck of this technology is currently the study of pre-breakdown and mechanical dispersion for the circuit breaker. The dielectric recovery characteristic curve was obtained through the electric field strength distribution of arc extinguish chambers under different opening distance in this paper. The closing and reclosing model of 1000kv transmission lines were built in electro-magnetic transient program ATP-EMTP. The simulation results show that the amplitude of operation overvoltage can be effectively suppressed by controlled switching and MOV. Therefore decreasing switching overvoltage plays an important role in reducing the air gap of the tower, which can lessen the investment cost of ultra-high voltage grid.
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2018, Vol. 33 
