| 引用本文: | 王德江,梁清华,王晓明.中性点不接地系统单相接地故障零序电流分析[J].电力系统保护与控制,2003,31(1):45-46. |
| .Discussion on a practicable relay protection scheme for the excitation transformer[J].Power System Protection and Control,2003,31(1):45-46 |
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| 摘要: |
| 对中性点不接地系统单相接地时零序暂态电流和零序全相电流特性进行分析。指出采用零序暂态电流选线时 ,由于存在无暂态过程的情况 ,因此有局限性 ;而采用零序基波电流选线 ,则必须在同一周波内完成采样 ,尽量增加采样点数 ,并在同一时刻精确测量对应采样点的量值 |
| 关键词: 暂态电流 基波电流 故障选线 |
| DOI：10.7667/j.issn.1674-3415.2003.01.010 |
| 分类号:TM41 |
| 基金项目: |
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| Discussion on a practicable relay protection scheme for the excitation transformer |
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王德江 梁清华 王晓明' target='_blank'>XU Shao lin
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| Abstract: |
| It is difficult to size the current transformer at high voltage side of the excitation transformer,since the extreme short circuit current would take place at the large generator outlet of a generator transformer set.So that to decrease the accuracy limit factor an idea to take the protective duty of internal faults cooperating with unclosed differential protections of the generator transformer/main transformer and the relay protection special for the excitation transformer is presented.And some rated transformation ratios of the current transformer are proposed for reference.Meanwhile comparing the differential protection with the over current protection of the excitation transformer,the over current protection is suggested to simplify the relay protection. |
| Key words: excitation transformer,relay protection,accuracy limit factor,rated transformation ratio |
