57 / 2021-06-01 11:26:31

基于ANSOFT Maxwell的特高压断路器开断试验回路用球隙开关设计

基于ANSOFT Maxwell的特高压断路器开断试验回路用球隙开关设计

摘要：本文结合Ansoft Maxwell软件，针对特高压断路器试验回路设计了一种具有光触发能力的球隙开关，阐述了这种球隙开关的技术方案和原理，并且分析了影响球隙开关性能的几个重要因素。根据球隙的结构特点进行了电场有限元近似计算和分析，确定了在不同的间隙下开关的自放电临界电压以及触发放电临界电压等关键参数，从而为球隙开关应用于不同的额定电压下的间隙选择以及触发电压选择等提供了依据。最后研制了球隙开关的样机，通过现场自放电和触发放电试验证明了本文的分析是基本正确的，所提的设计方案是可行的。

关键词：Ansoft Maxwell；电场计算；特高压断路器；球隙开关；试验

Design of ball gap switch for breaking test circuit of UHV Circuit Breaker Based on ANSOFT Maxwell

Abstract：In this paper combined with Ansoft Maxwell software, a light-triggered ball gap switch is proposed for the test circuit of Ultra High Voltage Circuit Breaker. The technical scheme and principle of the switch are discussed. Meanwhile, several key factors, which have important effect on the characteristics of the ball gap switch, are analyzed. By means of the finite-element method, the electric field across the ball gap of the switch is calculated and estimated, so as to determine in different gap distance the minimum breakdown voltage without triggering, as well as that with triggering. The design criteria from the results, including optimum selection of the gap distance and triggering voltage, are obtained for the switch applying for the different rated voltage. Finally, an actual experimental prototype of the ball gap switch is developed on which the breakdown tests with and without triggering are carried out. The results show the theoretical analysis offered in the paper are accurate to some extent. And the design idea of the ball gap switch is feasible.

Keywords：Ansoft Maxwell；Electric field calculation；UHV circuit breaker; ball gap switch; test