| 20Hz注入式定子接地保护在扩大单元接线发电机组上的应用 |
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| 引用本文： | 刘春秋,葛宝明,毕大强.20Hz注入式定子接地保护在扩大单元接线发电机组上的应用[J].电力系统保护与控制,2011,39(3):40-45. |
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| 作者姓名： | 刘春秋 葛宝明 毕大强 |
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| 作者单位： | 1.北京交通大学电气工程学院，北京 100044;2.电力系统国家重点实验室，清华大学电机系，北京 100084 |
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| 基金项目： | 中国电机工程学会电力青年科技创新项目资助 |
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| 摘 要： | 针对目前注入式定子接地保护不具备选择性，无法应用在扩大单元接线发电机组的问题，提出了一种新的注入式定子接地保护方案。该方案首先计算发电机组接地电阻的值以判断是否存在接地故障，当检测到接地故障后，以注入的20 Hz电压的相位为基准，将测量到的发电机中性点与机端处的20 Hz电流作差后的相位与之比较，通过这个相位关系来判断故障发电机，实现选择性停机。仿真结果验证了新方案计算接地故障过渡电阻和判断故障发电机的准确性，实现了注入式定子接地保护在扩大单元接线机组上的应用。
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| 关 键 词： | 扩大单元接线 发电机 注入式 定子接地保护 接地变压器 |
Application of injecting 20Hz source-based stator ground fault protection for generators in expanded unit connection |
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| LIU Chun-qiu,GE Bao-ming ,BI Da-qiang.Application of injecting 20Hz source-based stator ground fault protection for generators in expanded unit connection[J].Power System Protection and Control,2011,39(3):40-45. |
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| Authors: | LIU Chun-qiu GE Bao-ming BI Da-qiang |
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| Affiliation: | LIU Chun-qiu1,GE Bao-ming 1,BI Da-qiang 2(1.School of Electrical Engineering,Beijing Jiaotong University,Beijing 100044,China,2.State Key Lab of Power Systems,Dept of Electrical Engineering,Tsinghua University,Beijing 100084,China) |
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| Abstract: | At present,the stator ground fault protection of generator through injecting 20 Hz voltage cannot be used in generators connected to expansion units due to lack of selectivity.This paper proposes an improved protection scheme to realize the selectivity. The proposed scheme firstly calculates the ground resistance value of generators to determine whether ground fault occurs. When the ground fault is detected,the 20Hz differential current between the neutral and terminal of each generator can be obtained .The... |
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| Keywords: | expansion unit connection generator injecting source stator ground fault protection earthing transformer |
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