| 变压器零序功率方向保护接线的正确性分析 |
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| 引用本文： | 王红霞.变压器零序功率方向保护接线的正确性分析[J].电力系统保护与控制,2005,33(23):73-78. |
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| 作者姓名： | 王红霞 |
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| 作者单位： | 宁夏天净电力勘察设计有限公司，宁夏 银川 750002 |
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| 摘 要： | 多绕组主变压器的零序功率方向保护所用的3U0和3I0,运行实践表明,由于现场安装调试、运行维护人员在带负荷检查和安装接线的错误,使方向保护在系统故障时误动和拒动。为此该文利用对称分量法,分析电力系统发生不对称接地故障时的零序电流分布情况,得出如何判断三绕组主变压器高、中压侧零序功率方向保护的正确接线,并提出现场调试、运行维护中应该注意的事项,对防止主变压器零序功率方向保护误接线和误判断、误动有参考的价值。
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| 关 键 词： | 变压器 中性点接地 零序电流 零序功率 误动 |
| 文章编号： | 1003-4897(2005)23-0073-06 |
| 收稿时间： | 2005-05-12 |
| 修稿时间： | 2005-06-09 |
On connection correctness of directional zero-sequence power protection of power transformer |
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| WANG Hong-xia.On connection correctness of directional zero-sequence power protection of power transformer[J].Power System Protection and Control,2005,33(23):73-78. |
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| Authors: | WANG Hong-xia |
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| Affiliation: | Ningxia Tianjing Electric Power Survey and Design Co., Ltd, Yinchuan 750002, China |
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| Abstract: | Operational experience shows that wrong connections of 3U0 and 3I0 used by the directional zero-sequence power protection of main transformer will cause the protection to be maloperation or miss trip on power system fault. By symmetrical component analysis method, this paper analyzes the distribution of zero-sequence current in unsymmetric earthing fault of power system. Consequently, it is clear that how to discriminate the correct connection of directional zero-sequence power protection on high and middle voltage sides of 3-windings main transformer. This paper puts forward some countermeasures in on-site test and maintenance as well. |
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| Keywords: | power transformer neutral earthing zer-sequence current zero-sequence power maloperation |
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