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| UR T35/T60变压器差动保护误动分析 | |
| 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) |
| 作者姓名： | 方愉冬 杨涛 吴春娣 |
| 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 |
| 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. |
| 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) | |
| Authors: | FANG Yu-dong YANG Tao WU Chun-di |
| 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 relay percent differential operating characteristic setting and 2nd harmonic restraint choice. |
| Keywords: | transformer differential protection inrush current CT transient saturation mal-operation |
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