| 变压器励磁涌流和内部故障电流识别研究 |
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| 引用本文： | 刘建利,蔡舒平.变压器励磁涌流和内部故障电流识别研究[J].煤炭技术,2010,29(3). |
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| 作者姓名： | 刘建利 蔡舒平 |
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| 作者单位： | 江苏大学,电气信息工程学院,江苏,镇江,212013 |
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| 基金项目： | 江苏省高校高级人才科研基金(04JDG021) |
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| 摘 要： | 针对变压器差动保护无法准确识别励磁涌流和内部故障电流的难题,在瞬时无功功率理论基础上,提出一种通过比较变压器两侧差瞬时有功和差瞬时无功直流分量比值变化情况来识别励磁涌流和内部故障电流的新原理。该原理避开变压器内部复杂的磁链关系,从能量守恒的角度揭示了变压器励磁涌流和内部故障电流本质上的不同。MATLAB仿真结果表明:新原理简单易行,识别效果显著。
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| 关 键 词： | 变压器保护 瞬时无功功率理论 励磁涌流 |
Research on Discriminating Inrush Current and Internal Fault Current in Transformer Protection |
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| LIU Jian-li,CAI Shu-ping.Research on Discriminating Inrush Current and Internal Fault Current in Transformer Protection[J].Coal Technology,2010,29(3). |
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| Authors: | LIU Jian-li CAI Shu-ping |
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| Affiliation: | College of Information and Electrical Engineering/a>;Jiangsu University/a>;Zhenjiang 212013/a>;China |
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| Abstract: | The correct identification of the inrush current and the internal fault has been a difficult issue in the transformer differential protection.Based on the instantaneous reactive power theory,a new principle compared the variation of DC component ratio of active power to reactive power of transformer differential power is proposed to identify the inrush current and the internal fault current.This principle avoids the transformer interior complex flux linkage relations,and reveals essential difference between... |
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| Keywords: | transformer protection theory of instantaneous reactive power inrush current |
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