| 变压器谐波闭锁差动保护新判据 |
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| 引用本文： | 王祖光,任杰,仇新宏,赵安国,杨小铭.变压器谐波闭锁差动保护新判据[J].电力系统自动化,2006,30(14):0-0. |
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| 作者姓名： | 王祖光 任杰 仇新宏 赵安国 杨小铭 |
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| 作者单位： | 1. 国电自动化研究院/南瑞集团公司,江苏省,南京市,210003
2. 山东聊城供电公司,山东省,聊城市,252000 |
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| 摘 要： | 分析了变压器差动保护中的励磁涌流二次谐波成分,认为对称性涌流中的二次谐波分量对于闭锁谐波制动差动保护是足够的,提出借助直流分量加强二次谐波作用的新判据.提出的另一判据是用定增斜率制动特性取代原用的双斜率制动特性.分析计算、试验和试运行经验证明了所提出的新判据正确、可行.
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| 关 键 词： | 变压器差动保护 二次谐波 直流分量 励磁涌流 定增斜率 |
| 收稿时间： | 1/1/1900 12:00:00 AM |
| 修稿时间： | 1/1/1900 12:00:00 AM |
New Criteria for Harmonic Blocking Differential Protection of Transformers |
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| WANG Zuguang,REN Jie,QIU Xinhong,ZHAO Anguo,YANG Xiaoming.New Criteria for Harmonic Blocking Differential Protection of Transformers[J].Automation of Electric Power Systems,2006,30(14):0-0. |
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| Authors: | WANG Zuguang REN Jie QIU Xinhong ZHAO Anguo YANG Xiaoming |
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| Affiliation: | 1. Nanjing Automation Research Institute, Nanjing 210003, China; 2. Liaocheng Electric Power Co, Liaocheng 252000, China |
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| Abstract: | The second harmonic component of magnetic inrush currents in transformer differential protection is analyzed. The analytical result shows that the second harmonic component of symmetric inrush current is big enough for blocking the differential protection. Hence a new criterion is proposed to intensify the second harmonic with the contribution of DC component. A second new criterion proposed is a constant-increase-of-slop restraint characteristic which replaces the old dual-slop percentage restraint characteristic. Analysis, tests and operation experiences prove the validity and feasibility of the proposed criteria. |
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| Keywords: | transformers differential protection second harmonic DC component magnetic inrush current constant-increase-of-slop |
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