| 雷击造成主变压器中性点击穿的原因分析及建议 |
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| 引用本文： | 胡晶晶,曾丽,饶林. 雷击造成主变压器中性点击穿的原因分析及建议[J]. 高压电器, 2007, 43(2): 143-145,148 |
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| 作者姓名： | 胡晶晶 曾丽 饶林 |
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| 作者单位： | 1. 重庆大学高电压与电工新技术教育部重点实验室,重庆,400044
2. 德阳电业局,四川,德阳,618000 |
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| 摘 要： | 介绍了德阳绵竹地区因雷击而造成的7台110 kV主变中性点间隙击穿并使其中5台跳闸的情况。详细分析了保护动作行为,并指出了主变压器跳闸的原因。校验了中性点间隙与避雷器之间的配合,提出了增大间隙并延长间隙过流保护动作时限以躲开线路重合闸的方法,以减少停电时间并避免主变压器不必要的跳闸。
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| 关 键 词： | 变压器 中性点 间隙 过电压 |
| 文章编号： | 1001-1609（2007）02-0143-03 |
| 修稿时间： | 2006-12-19 |
Analysis and Suggestions on the Neutral Point Breakdown of 7 Main Transformers Due to Lightning Stroke |
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| HU Jing-jing,ZENG Li,RAO Lin. Analysis and Suggestions on the Neutral Point Breakdown of 7 Main Transformers Due to Lightning Stroke[J]. High Voltage Apparatus, 2007, 43(2): 143-145,148 |
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| Authors: | HU Jing-jing ZENG Li RAO Lin |
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| Affiliation: | 1. The Key Laboratory of High Voltage Engineering and Electrical New Technology, Ministry of Education, Chongqing University, Chongqing 40044, China; 2. Sichuan Deyang Electric Power Bureau, Deyang 618000, China |
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| Abstract: | In terms of the tripping cases resulted from the neutral point breakdowns of seven 110 kV transformers due to lightning stroke in Deyang city,this paper analyses the protection action in detail,checks the coordinations between the neutral gap and the surge arrester protection level,and suggests that the line re-energization can be dodged through prolonging the gap overcurrent protection time and increasing the gap clearance. |
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| Keywords: | transformer neutral point gap overvoltage |
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