| UR T35/T60变压器差动保护误动分析 |
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| 引用本文： | 方愉冬,杨涛,吴春娣.UR T35/T60变压器差动保护误动分析[J].电力系统保护与控制,2009,37(14):118-121. |
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| 作者姓名： | 方愉冬 杨涛 吴春娣 |
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| 作者单位： | 1.浙江电力调度通信中心，浙江 杭州310007;2.浙江电力试验研究院，浙江 杭州310004;3.镇海发电厂，宁波 镇海315208 |
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| 摘 要： | 针对某电厂T35/T60变压器差动保护误动，对保护数据波形和整定值进行了分析。根据波形特征理论分析，排除了和应涌流引起差动保护误动的可能，指出系穿越性励磁涌流的非周期分量导致CT暂态饱和，从而引起采用“2-out-of-3”谐波制动方式的差动保护误动。最后针对误动事故，提出了T35/T60保护二次谐波制动方式选择和差动动作曲线整定上应采取的措施。
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| 关 键 词： | 主变差动保护 励磁涌流 CT暂态饱和 误动 |
Analysis on mal-operation of UR T35/T60 transformer differential protection |
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| FANG Yu-dong,YANG Tao,WU Chun-di.Analysis on mal-operation of UR T35/T60 transformer differential protection[J].Power System Protection and Control,2009,37(14):118-121. |
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| Authors: | FANG Yu-dong YANG Tao WU Chun-di |
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| Affiliation: | 1.Zhejiang Electric Power Dispatch and Communication Centre;Hangzhou 310007;China;2. Electric Power Test&Research Institute of Zhejiang Province;Hangzhou 310004;3. Zhenhai Power Plant;Zhenhai 315208;China |
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| Abstract: | The paper analyzes fault data and protection setting during a mal-operation of UR T35/T60 transformer differential protection relay.Based on theoretical analysis of waveform character, possibility of sympathetic inrush resulting in mal-operation is ruled out, and conclusion is drawn that mal-operation was caused by differential protection's "2-out-of-3" 2nd harmonic restraint mode and TA transient saturation due to through-by inrush current.The corresponding solution of mal-operation is proposed on T35/T60 ... |
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| Keywords: | transformer differential protection inrush current CT transient saturation mal-operation |
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