【摘要】 环保型罐式多断口真空断路器是未来高压真空断路器的发展趋势之一,但目前对罐式多断口真空断路器的均压配置问题研究不足。该文建立罐式多断口真空断路器三维电场模型,对比分析了罐式与传统柱式真空断路器的结构电压、电场分布和等效电容参数的差异,发现罐式结构对地杂散电容增大造成其电压分布更加不均匀。研究了罐式多断口真空断路器的单边、双边、三边和圆筒状的不同均压电容配置结构对断口间电压分布、罐体内部电场强度的影响规律。研究表明:不同均压配置结构的断口间均压效果由优到差依次为圆筒状、单边、三边、双边,圆筒状均压配置金属连接件处最大电场强度为3kV/mm,远小于其他方式的15～20kV/mm,该研究为罐式多断口真空断路器均压配置提供了参考依据。更多还原

【Abstract】 Environment-friendly tank type multi-break vacuum circuit breakers(TMCBs) is one of the future trends of high voltage vacuum circuit breaker, but the current research on the voltage-sharing configuration of TMCBs was insufficient. First of all, this paper proposed a three-dimensional electric field simulation model of the TMCBs, and the difference of voltage, electric field and equivalent capacitance parameter between tank structure and traditional column structure were compared and analyzed. Becaus the stray capacitance of the tank structure increased, its voltage distribution between breaks were more nonuniform. Then we designed the unilateral, bilateral, trilateral and cylindrical configurations of different grading capacitors, and studied the influence of different configurations on the voltage distribution between breaks and the change law of electric field inside the tank. From excellent to poor, the research shows that the voltage equalization effect of different configurations is cylindrical capacitors, unilateral capcacitors, trilateral capacitors and bilateral capcacitors. The maximum electric field strength between metal connection of cylindrical capacitors is 3 kV/mm, and is much less than 15～20 kV/mm of other capacitors configurations. This research provides a reference for the voltage-sharing configuration of tank type multi-break vacuum circuit breakers.更多还原