| PT二次误接线导致的定子接地保护拒动分析 |
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| 引用本文： | 吴笃贵,赵斌,郭宝甫,邓茂军,徐立明.PT二次误接线导致的定子接地保护拒动分析[J].电力系统保护与控制,2006,34(5):17-20. |
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| 作者姓名： | 吴笃贵 赵斌 郭宝甫 邓茂军 徐立明 |
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| 作者单位： | 许继电气保护及自动化事业部 河南许昌461000 |
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| 摘 要： | 国内某电厂的定子接地保护拒动起因于不正确的PT接线。文章分析了当PT二次侧采用B相接地时,PT与电压变换器的中性点连接方式对保护动作行为的影响。结论表明:当二者中性点断开时,保护装置的测量结果不能正确反映一次系统的运行状态,PT断线判据可能误动;而当中性点直接相连时,保护装置能够正确动作。
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| 关 键 词： | 定子接地 PT断线 B相接地 |
| 文章编号： | 1003-4897(2006)05-0017-04 |
| 收稿时间： | 2005-07-07 |
| 修稿时间： | 2005-08-24 |
Miss trip analysis of stator winding grounding fault due to false PT secondary connection |
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| WU Du-gui,ZHAO Bin,GUO Bao-fu, DENG Mao-jun,XU Li-ming.Miss trip analysis of stator winding grounding fault due to false PT secondary connection[J].Power System Protection and Control,2006,34(5):17-20. |
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| Authors: | WU Du-gui ZHAO Bin GUO Bao-fu DENG Mao-jun XU Li-ming |
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| Affiliation: | XJ Electric Protection and Automation Business Department,Xuchang 461000,China |
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| Abstract: | Failure to operation of stator winding grounding fault occurred in a domestic power plant resulted from false PT secondary connection.The paper analyzes the influence of connection mode between neutral points of PT and voltage transducers on actions of relay when phase B is grounded in PT secondary side.The conclusions show that measurements of relay protection could not reflect operation states of primary system and criterion of PT secondary broken connection may result in false operation when the connection between neutral points of PT and voltage transducers is broken.Protection relays can correctly operate when neutral points directly connected. |
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| Keywords: | stator winding grounding PT secondary broken connection phase B earthing |
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