| Yn/Y接线变压器单相接地短路差动保护动作分析 |
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| 引用本文： | 许建安. Yn/Y接线变压器单相接地短路差动保护动作分析[J]. 水电能源科学, 2008, 26(6) |
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| 作者姓名： | 许建安 |
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| 作者单位： | 福建水利电力职业技术学院,福建,永安,366000 |
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| 摘 要： | 分析了Yn/Y变压器微机差动保护在保护区外发生单相接地短路故障时,由于零序电流的存在将使变压器差动保护可能出现误动.用不对称理论对单相接地短路故障备序电流进行分析,得出变压器差动保护区外误动原因并提出防误动的措施.验证了变压器差动保护区内单相接地短路故障时单侧电源与双侧电源的变压器差动保护的灵敏度.
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| 关 键 词： | 微机差动保护 单相接地故障 补偿方式 比率制动特性 |
Action Analysis of Differential Protection of Yn,Y Connection Transformer during Single-phase Grounding Short Circuit Occurence |
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| XU Jian''an. Action Analysis of Differential Protection of Yn,Y Connection Transformer during Single-phase Grounding Short Circuit Occurence[J]. International Journal Hydroelectric Energy, 2008, 26(6) |
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| Authors: | XU Jian''an |
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| Affiliation: | XU Jian'an(Fujian Water Conservancy , Power Professional Technical College,Yongan 366000,China) |
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| Abstract: | Because of the existence of zero sequence current,the transformer differential protection may function improperly when the single-phase grounding short circuit fault happens outside the microcomputer based transformer differential protection area.The asymmetry theory is used in this paper to analyze every sequence current with single-phase grounding fault,and the cause of out-area malfuntion of transformer differential protection is analyzed and the measure to prevent the malfunction is also put forward.Thi... |
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| Keywords: | microcomputer differential protection single-phase grounding fault compensation method ratio-restrained characteristic |
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