| 复杂和应涌流导致差动保护误动的原因与对策 |
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| 引用本文： | 金明亮,尹项根,游大海.复杂和应涌流导致差动保护误动的原因与对策[J].中国电机工程学报,2011(1). |
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| 作者姓名： | 金明亮 尹项根 游大海 |
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| 作者单位： | 电力安全与高效湖北省重点实验室(华中科技大学); |
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| 基金项目： | 国家自然科学基金项目(50877031,50837002)~~ |
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| 摘 要： | 针对复杂和应涌流导致差动保护误动问题,建立了复杂和应涌流研究模型,利用拉普拉斯变换求出解析解,揭示了变压器的磁链变化过程和复杂和应涌流的机制特征。结合变压器饱和与电流互感器(current transformer,CT)暂态饱和的特点,从变压器自身和CT饱和两方面分析了差动保护的误动原因。仿真研究了发变组产生复杂和应涌流的实例,验证了理论研究结果的正确性。以时间、差流、制动电流和二次谐波含量为不同的坐标轴绘制了保护工作点的二维和三维轨迹曲线,完整地展现了保护误动过程和差流、二次谐波含量变化特征。提出了变比率制动差动保护,通过实时改变比率制动系数值来提高保护性能。测试结果表明,该保护性能可靠,能有效解决常规差动保护误动的问题。
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| 关 键 词： | 电力系统 复杂和应涌流 差动保护 拉普拉斯变换 二次谐波制动 轨迹特征 |
Reason of Differential Protection Mal-operation Caused by Complex Sympathetic Inrush and Its Countermeasure |
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| JIN Mingliang,YIN Xianggen,YOU Dahai,Wuhan ,Hubei Province,China.Reason of Differential Protection Mal-operation Caused by Complex Sympathetic Inrush and Its Countermeasure[J].Proceedings of the CSEE,2011(1). |
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| Authors: | JIN Mingliang YIN Xianggen YOU Dahai Wuhan Hubei Province China |
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| Affiliation: | JIN Mingliang,YIN Xianggen,YOU Dahai(Hubei Electric Power Security and High Efficiency Key Lab(Huazhong University of Science and Technology),Wuhan 430074,Hubei Province,China) |
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| Abstract: | In order to solve the problem of differential protection mal-operation caused by the complex sympathetic inrush,the complex sympathetic inrush model is constructed.The flux linkage and current of transformer are expressed by analytic solution,which explain the variation course of flux linkage and the characteristic of the sympathetic inrush.The reasons of the differential protection mal-operation are explained with both sides of transformer and current transformer saturation.The theory analysis results are ... |
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| Keywords: | power system complex sympathetic inrush differential protection Laplace transformer second harmonic restraint locus characteristic |
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