| 基于虚拟制动电流采样点差动的CT饱和识别方法 |
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| 引用本文： | 杨恢宏,谢百煌,毕大强,张项安,王维俭.基于虚拟制动电流采样点差动的CT饱和识别方法[J].电力系统保护与控制,2006,34(13):50-53. |
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| 作者姓名： | 杨恢宏 谢百煌 毕大强 张项安 王维俭 |
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| 作者单位： | 许继电气保护及自动化事业部 河南许昌461000(杨恢宏，张项安)，陕西省电力公司调度中心 陕西西安710004(谢百煌)，清华大学电力系统及发电设备控制和仿真国家重点实验室 北京100084(毕大强，王维俭) |
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| 摘 要： | 分析了CT饱和产生的机理以及CT饱和后二次电流的本质特征,根据一次电流过零点附近CT二次电流存在线性传递区的特点,提出基于虚拟制动电流采样点差动的识别CT饱和方法。理论分析与动模试验结果表明,该方法能够很好地解决变压器区外故障时由于电流互感器饱和造成变压器比率差动保护误动的问题,进一步提高了差动保护的可靠性,具有实际应用的价值。
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| 关 键 词： | 差动保护 虚拟制动 CT饱和 |
| 文章编号： | 1003-4897(2006)13-0050-04 |
| 收稿时间： | 2005-12-08 |
| 修稿时间： | 2006-03-08 |
Using the sampling differential protection based on the constructed restraint current to identify CT saturation |
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| YANG Hui-hong, XIE Bai-huang, BI Da-qiang, ZHANG Xiang-an ,WANG Wei-jian.Using the sampling differential protection based on the constructed restraint current to identify CT saturation[J].Power System Protection and Control,2006,34(13):50-53. |
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| Authors: | YANG Hui-hong XIE Bai-huang BI Da-qiang ZHANG Xiang-an WANG Wei-jian |
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| Abstract: | This paper analyzes the mechanism which caused CT saturation and the essential character of the current secondary side at CT saturation.According to the linear zone of secondary current of CT near the primary current across zero,a method is proposed to identify CT saturation by using the sampling differential protection based on the constructed restraint current. The theoretical analysis and experiments verify that the method can prevent the differential protection from mal-operating while the CT enters into saturation caused by the external fault.The reliability of differential protection is improved,and the method has been applied in the practice. |
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| Keywords: | differential protection constructed restraint current CT saturation |
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