| 引用本文: | 林海源,吴小妹,吕庭钦,高可辉.一起主变间隙保护误动事故分析及处理[J].电力自动化设备,2012,32(6): |
| LIN Haiyuan,WU Xiaomei,LV Tingqin,GAO Kehui.Analysis of main transformer gap protection misoperation and countermeasure[J].Electric Power Automation Equipment,2012,32(6): |
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| 摘要: |
| 220 kV变压器是半绝缘变压器，即位于中性点附近变压器绕组部分对地绝缘比其他部位弱，中性点的绝缘容易被击穿。一般装有间隙保护，传统间隙保护的间隙零序电流和零序电压共用一个延时元件。通过一起雷击线路造成的主变间隙保护动作事故，分析了这起间隙保护动作的原因，得出零序电压、间隙零序电流作为变压器不同运行方式下的2种保护，不应该通过相同的延时跳闸，间隙零序电流保护的延时应适当延长与线路的重合闸时间配合。 |
| 关键词: 间隙保护 零序电压 零序电流 中性点 变压器 绕组 绝缘 |
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| Analysis of main transformer gap protection misoperation and countermeasure |
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LIN Haiyuan, WU Xiaomei, LV Tingqin, GAO Kehui
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Fuzhou Electric Power Bureau，Fuzhou 350009，China
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| Abstract: |
| 220 kV transformer is a kind of semi-insulating transformer and the insulation against ground of its windings near its neutral point is weaker，for which a gap protection is usually equipped. The gap zero-sequence current and zero-sequence voltage of traditional gap protection share the same delay component. An action of main transformer gap protection during a lightning strike of line is analyzed and the conclusion is that，as the gap zero-sequence current and zero-sequence voltage are used in two types of transformer protection under different operation modes，they should have different delayed trips. The delay of gap zero-sequence current protection should be longer，coordinating with the line reclose time. |
| Key words: gap protection zero-sequence voltage zero-sequence current neutral point electric transformers electric windings insulation |
