中国电机工程学报2016，Vol.36Issue(19)：5357-5364,8.DOI:10.13334/j.0258-8013.pcsee.152253
多断口直流真空断路器介质恢复强度研究
Investigations on Dielectric Recovery Strength for the DC-VCB With Multi-breaks
摘要
Abstract
For the 126kV DC vacuum circuit breakers (VCBs) with multi-breaks, the continuous transition model, metal vapor and ion density were introduced to describe the dynamic mathematical model of dielectric recovery with intermediate frequency vacuum arcs. During the breaking process, the numerical simulation was employed to obtain the thickness of the sheath and the curves of the dielectric recovery strength. Based on the numerical simulation, the relationship between the dynamic variation of the sheath and dielectric recovery was obtained. And the statistics can help to analyze the current, transient recovery voltage, electric field strength and dielectric recovery characteristics on the new cathode surface. By comparative analysis, the distribution of transient recovery voltage (TRV) and the factors affecting the dielectric recovery strength could be achieved. The simulation results show that: due to the line impedancebetween the breaks, the voltage and arc energy distribution of each break is not uniform, and the voltage and arc energy distribution on the break are higher than that of the other breaks, the metal vapor has a high initial density, the drop rate of the post-arc current is larger, the rate of TRV is higher and the development speed of sheath is slower. The surface electric field strength on the new cathode is higher. It could initiate re-strike and approach to breaking failure for the whole CB. And larger capacitor is preferred to ensure the reasonable distribution of TRV and improve the breaking probability of DC VCBs with multi-breaks.关键词
多断口直流真空断路器/连续过渡模型/瞬态恢复电压/介质恢复强度/金属蒸气密度Key words
DC-VCB with multi-breaks/continuous transition model/transient recovery voltage/dielectric recovery strength/metal vapor density分类
信息技术与安全科学引用本文复制引用
刘晓明,黄翀阳,邹积岩..多断口直流真空断路器介质恢复强度研究[J].中国电机工程学报,2016,36(19):5357-5364,8.基金项目
国家自然科学基金项目(51377106)；国家自然科学基金重点项目(51337001)。 Project Supported by the National Natural Science Foundation of China (51377106) （51377106）
Key Project Supported by the National Natural Science Foundation of China (51337001) （51337001）
