环保型罐式多断口真空断路器电场分析与优化

Electric Field Analysis and Optimization of 126 kV Environmental Protection Gas Insulated Tank Circuit Breakers

环保替代SF_(6)断路器是高压开关领域亟待解决的问题。文中提出一种基于多断口真空开关灭弧、环保气体绝缘的全环保型罐式多断口真空断路器思路与整体方案。采用COMSOL Multiphysics软件建立126kV环保型罐式多断口真空断路器电场模型,仿真得到罐体内部多断口真空开关连接结构、灭弧室等关键部件电场分布。依据该电场分布对罐体内部绝缘薄弱部分进行优化设计,确定罐式断路器结构参数,将罐体内最大电场强度由30.5 MV/m降低为18.5 MV/m。通过分析环保型CF3I气体的绝缘特性,联合电场分析与电场优化结果对环保绝缘气体初步选型,初步得到了126 kV全环保型罐式多断口真空断路器的设计,为后续126 kV罐式多断口真空断路器样机研制及更高等级罐式多断口断路器样机研制提供了理论依据。

Environmental-friendly replacement of SF_(6) circuit breakers is an urgent task in the field of high-voltage breaker gear. This article proposes an all-environmental-friendly tank-type multi-break vacuum circuit breaker idea and overall plan based on multi-break vacuum breaker arc extinguishing and environmentally friendly gas insulation. The electric field model of a 126 kV environmentally-friendly tank-type multi-break vacuum circuit breaker was established using the COMSOL Multiphysics software. The electric field distributions of key components such as the connection structure of the multi-break vacuum switch and the interrupter inside the tank were obtained by simulation, and the weak part of the electric field was optimized. Furthermore, the insulation characteristics of environmentally-friendly CF3I gas were analyzed, and the environmentally-friendly insulating gas was selected based on the results of electromagnetic analysis and optimization. Through electric field analysis and optimization, the structural parameters of the tank circuit breaker were determined, and the maximum electric field intensity in the tank was reduced from 30.5 MV/m to 18.5 MV/m. The design of the 126 kV all-environmental-friendly tank-type multi-break vacuum circuit breaker has been initially obtained, which provides a theoretical basis for the subsequent 126 kV tank-type multi-break circuit breaker prototype development and the development of higher-level tank-type multi-break circuit breaker prototypes.