雷电过电压引起灭弧室爆炸过程暂态分析

doi:10.11930/j.issn.1004-9649.2014.8.33.4

摘要/Abstract

摘要： 为了定量描述雷电过电压引起断路器灭弧室爆炸的全过程,以提出相应的预防措施,利用EMTP电磁暂态程序,以国内某220 kV电力系统为例,对雷击杆塔后断路器断口处的雷电过电压进行了计算。同时,依据热力学原理和气体状态方程,对断口燃弧产生的能量及由此引起的灭弧室压力升高进行了计算。最后,研究了燃弧时间和雷电流幅值对电弧能量及灭弧室压力的影响,提出了预防灭弧室爆炸的措施及绝缘配合相关意见。研究表明,灭弧室爆炸是由于电弧能量使其内部气压过大造成的,减小燃弧时间可降低电弧能量。雷电流的大小不是灭弧室爆炸的决定因素,而是其断口击穿的触发条件。在变电站进出线处安装避雷器可有效降低雷电冲击电压的幅值。

关键词: 雷电过电压, 断路器, 灭弧室, 爆炸, 电弧能量, SF6, 压力, 避雷器, 暂态分析

Abstract: In order to quantitatively describe the whole course of the circuit breaker explosion caused by lightning and to find some relevant measures, by taking a 220 kV substation in China for a case study, the lightning overvoltage on the circuit breaker contact after lightning striking on the tower is calculated by using the EMTP. Meanwhile, based on thermodynamics theory and gas condition function, the energy produced by arc across the contacts and the pressure in extinguisher are calculated. Eventually, the effects of arcing time and lightning current amplitude on arc energy and pressure in extinguisher is analyzed, and some measures for preventing extinguisher explosion and suggestions for insulation coordination are proposed. The research demonstrates that the extinguisher explosion is resulted from the large pressure generated by arc energy in the extinguisher and reducing the arcing time can reduce the arc energy. The magnitude of lightning current is not the determining factor for extinguisher explosion but the inducing condition for breaker contact breakdown. Mounting a MOA on the inlet/outlet line of the substation can effectively reduce the amplitude of lightning overvoltage.

Key words: lightning overvoltage, circuit breaker, extinguisher, explosion, arc energy, SF6, pressure, MOA, transient analysis

中图分类号:

TM863

李爽, 李冠华, 朱义东, 韩洪刚. 雷电过电压引起灭弧室爆炸过程暂态分析[J]. 中国电力, 2014, 47(8): 33-37.

LI Shuang, LI Guan-hua, ZHU Yi-dong, HAN Hong-gang. Transient Analysis on Circuit Breaker Explosion Caused by Lightning Overvoltage[J]. Electric Power, 2014, 47(8): 33-37.

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链接本文: https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.2014.8.33.4

https://www.electricpower.com.cn/CN/Y2014/V47/I8/33

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