串联超高压真空断路器多断路绝缘特性研究

Xiaoming Liu, Z. Lai, Yundong Cao, Xiangning Liu, J. Zou
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引用次数: 3

摘要

多断路串联是超高压真空断路器(EHV vcb)设计中采用的一种测量方法。由于多物理场的耦合和瞬态变化的存在,多断裂串联是覆盖多个物理参数的均匀大时空场系统。而串联系统每次断路时的绝缘性能变化比一次断路时大,对未知因素的研究是必要的。根据超高压断路器在系统中的应用,动态绝缘协调性能包括各分断的动态绝缘和串联多分断的动态绝缘设计。本文采用有限元法对串联三断真空灭流器的三维电场进行了数值模拟。并计算出了最大电场强度的位置和动、定接触表面的电场分布。通过对不同绝缘结构的串联对比分析,得出并说明了电场强度的变化规律。通过引入屏蔽罩和并联电容器,完成了各72.5 VI单元的设计,并对220kV串联超高压断路器的绝缘性能进行了分析。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Research on insulation characteristics of multi-break in series extra high voltage vacuum circuit breaker
Multi-break in series is the measurement applied in the design of the extra high voltage vacuum circuit breakers (EHV VCBs). Because of the existence of the coupling and transient variation of the multi-physical fields, the multi-break in series is the uniformed large space-time field system covering the multiple physical parameters. And the insulation performance for each break in the series system change a lot than one break case, and the investigations on the unknown factors are necessary. Based on the application of the EHV VCB applied in the system, the dynamic insulation coordination property covers the dynamic insulation of each break and the design of the multi-break in series. In this paper, the 3D electric field of the triple-break vacuum interrupter (VI) in series is numerically simulated using finite element method (FEM). And the location of the maximum electric field strength and the field distribution along the surface of the movable and fixed contact are calculated and figured out. By the comparative analyses with different insulation structures in series, the variations of the electric field strength are obtained and illustrated. Moreover, by introducing the shielding covers and parallel capacitors, the design of each 72.5 VI unit is accomplished and the insulation property of the 220kV triple-break in series EHV VCB is analyzed.
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