摘要
研究发现单断口或者常规串联双断口真空断路器,无法有效提高电容器组开断参数、降低重击穿概率的原因为无法避免高频涌流电弧对触头表面的烧蚀破坏,从而导致断口绝缘强度大为降低。研究获得了高频涌流电弧烧蚀对真空断口绝缘强度和串联断口分压特性的影响规律;高频涌流电弧烧蚀对单个真空灭弧室和串联双真空断口绝缘强度的影响规律及串联断口的分压规律。实验结果表明,真空灭弧室受到涌流电弧烧蚀后场致发射电流大大增加,触头表面破坏越严重场致发射电流越大。触头都受到烧蚀后的串联双断口各自分压约50%,而未受烧蚀灭弧室与受烧蚀灭弧室的串联双断口,前者分压大于70%。以上研究成果可为提高断口绝缘强度、提升断路器电容器组开断参数及降低重击穿概率提供理论参考。
It is found by the research that the reason that vacuum circuit breaker with either single break or with com⁃monly series two breaks has no way to improve the capacitor bank breaking parameters and reduce the re⁃strike prob⁃ability is that it can not avoid the ablation of high frequency inrush current on the contact surface,thus reducing sig⁃nificantly the insulation strength across the open contacts.The influence of arc ablation of high frequency inrush cur⁃rent on the insulation strength of vacuum interrupter and voltage distribution characteristic of series break is obtained by the research.The influence of high frequency inrush current arc ablation on the insulation strength of individual vacuum interrupter and series double vacuum break is also obtained.The experimental result shows that the filed emission current of the vacuum interrupter,after ablation of inrush current,increases significantly.The more seri⁃ous the contact surface damage is,the higher the field emission current is.The voltage distribution of series double⁃break after ablation of contact is approximately 50%respectively,while for the series two break without and with ab⁃lation,the the voltage distribution of the former is 70%higher than that of the latter.The research result above can provide theoretical reference for improving insulation strength of the open contacts,improving the breaking parame⁃ters of the capacitor bank of the circuit breaker and reducing re⁃strike probability.
作者
赵峰
杨和
李玲
ZHAO Feng;YANG He;LI Ling(PDSS APAC of Eaton(China)Investments Co.,Ltd.,Shanghai 200335,China;Cooper(Pingdingshan)Edison Electronic Technology Co.,Ltd.,Henan Pingdingshan 467000,China;Cooper(Ningbo)Electric Co.,Ltd.,Zhejiang Ningbo 315336,China)
出处
《高压电器》
CAS
CSCD
北大核心
2023年第4期169-176,共8页
High Voltage Apparatus
关键词
真空灭弧室
涌流
场致发射电流
绝缘强度
电压分布
vacuum interrupter
inrush current
field emission current
insulation strength
voltage distribution
