摘要
介绍了混合型直流真空断路器的工作原理,分析了其面临的过电压问题。利用等效电路模型阐述了合闸过电压的产生机理,指出了关合过电压是造成换流晶闸管损坏的原因。针对限压器和阻容保护装置保护方法的不同特点,提出了金属氧化物压敏电阻MOV和阻容保护装置相结合的过电压保护措施。最后,试验验证了分析和方法选择的正确性。
It has long been recognized that the vohage surge event is a big problem when using vacuum circuit breaker. The over-voltage issue of hybrid DC vacuum circuit breaker was discussed based on its principle. The mechanism of voltage surge when closing the contacts was investigated with an equivalent model. The failure of transition thyristor can be ascribed to the voltage surge. Since metal oxide varistor （MOV） and resistance- capacitance protective device have very different characteristics, the protection technology which combines the benefits of both was discussed. The effectiveness of the analysis and methods was demonstrated by experiments.
出处
《低压电器》
2013年第10期6-9,26,共5页
Low Voltage Apparatus
基金
国家青年科学基金(51207166)
