| 吉林省电网220 kV变压器中性点保护间隙的选择 |
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| 引用本文： | 董恩伏,郑良华.吉林省电网220 kV变压器中性点保护间隙的选择[J].吉林电力,2007,35(5):26-28. |
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| 作者姓名： | 董恩伏 郑良华 |
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| 作者单位： | 1. 吉林省电力有限公司,吉林,长春,130021
2. 吉林省电力有限公司电力科学研究院,吉林,长春,130021 |
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| 摘 要： | 分析、计算了220 kV系统中变压器中性点不接地时的过电压,根据国家电网公司和有关规程对变压器中性点保护的规定,提出了吉林省电网220 kV变压器中性点不接地采用单独290 mm间隙保护方式,使有效接地系统发生单相接地暂态过电压时保护不动作,保护变压器中性点在雷电冲击时绝缘不受损害。
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| 关 键 词： | 中性点保护间隙 变压器 220 kV电压等级 |
| 文章编号： | 1009-5306（2007）05-0026-03 |
| 修稿时间： | 2007-08-05 |
Protective Gap Selection on Neutral-point of 220 kV Transformers in Jilin Province |
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| DONG En-fu,ZHENG Liang-hua.Protective Gap Selection on Neutral-point of 220 kV Transformers in Jilin Province[J].Jilin Electric Power,2007,35(5):26-28. |
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| Authors: | DONG En-fu ZHENG Liang-hua |
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| Abstract: | The overvoltage in 220 kV neutral unearthed transformer is analysed. According to the protective specifies of the related regulations to the transformer neutral point in the State Grid Co. , single 290 mm protective gap is adopted in 220 kV neutral unearthed transformers in Jilin Power Grid. The transient overvoltage protection does not act when single phase earthing occurred in effectively grounding system, So the insulation of the neutral point of the transformers does not be injured in lightning surge. |
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| Keywords: | neutral point protective gap electric transformer voltage range 220 kV |
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