| 零序电流对数字变压器差动保护Y,d矢量变换的影响及对策 |
| |
| 引用本文： | 丁网林,骆健,刘强.零序电流对数字变压器差动保护Y,d矢量变换的影响及对策[J].电力系统自动化,2004,28(5):56-58. |
| |
| 作者姓名： | 丁网林 骆健 刘强 |
| |
| 作者单位： | 1. 南京中德保护控制系统有限公司,江苏省,南京市,210003
2. 南京供电公司,江苏省,南京市,210008 |
| |
| 摘 要： | 数字式变压器差动保护在星形侧发生外部单相接地或线路单相遭雷击的情况下，差动保护有时会误动。文中在深入分析矢量变换对差动电流影响的基础上，分析了变压器差动保护误动的原因，并提出基于零序电流补偿的三角形(△)侧向星形(Y)侧矢量变换的方法。该方法通过中性点零序电流和Y侧三相相电流的计算零序电流进行相位比较来决定是否消除Y侧的零序电流。最后通过实例证明了该方法的正确性。
|
| 关 键 词： | 变压器保护 差动保护 Y，d矢量变换 零序电流 |
EFFECT OF ZERO-SEQUENCE CURRENT ON STAR-DELTA VECTOR TRANSFORM OF DIGITAL TRANSFORMER DIFFERENTIAL PROTECTION |
| |
| Ding Wanglin,Luo Jian,Liu Qiang.EFFECT OF ZERO-SEQUENCE CURRENT ON STAR-DELTA VECTOR TRANSFORM OF DIGITAL TRANSFORMER DIFFERENTIAL PROTECTION[J].Automation of Electric Power Systems,2004,28(5):56-58. |
| |
| Authors: | Ding Wanglin Luo Jian Liu Qiang |
| |
| Abstract: | Digital transformer differential protection may falsely take effective when external single-phase earth fault occurs at star side or the line endures lightning strike on single phase. Based on analyzing the influence of vector transformation on differential current, this paper analyzes the reason of this type of actions and proposes a new vector transform from delta side to star side with zero-sequence current compensation. Phase comparison of zero-sequence current at neutral point with measuring zero-sequence current at star side is therefore made to decide whether the zero-sequence current at star side is eliminated. Finally, two application examples verify the correctness of the proposed method. |
| |
| Keywords: | transformer protection differential protection vector transform zero-sequence current |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《电力系统自动化》浏览原始摘要信息 |
|
点击此处可从《电力系统自动化》下载全文 |
