| 基于电流采样值相间差的小电流接地系统接地保护方法 |
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| 引用本文： | 曾祥君,王媛媛,夏云峰,穆大庆.基于电流采样值相间差的小电流接地系统接地保护方法[J].长沙理工大学学报(自然科学版),2006,3(3):78-83. |
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| 作者姓名： | 曾祥君 王媛媛 夏云峰 穆大庆 |
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| 作者单位： | 长沙理工大学,电气与信息工程学院,湖南,长沙,410076 |
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| 基金项目： | 国家自然科学基金;教育部跨世纪优秀人才培养计划;教育部霍英东教育基金会高等院校青年教师基金 |
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| 摘 要： | 小电流接地系统单相接地故障电流小,弧光接地故障保护精度以及可靠性差.通过测量各馈线相电流采样值变化量的相间差值来实现接地保护,当相间差值大于整定值的采样点数超过一定数时,判断为接地故障,并完成馈线接地保护装置的研制.EMTP仿真分析和动模实验表明,该方法具有抗弧光能力强、保护精度与可靠性高等特点.
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| 关 键 词： | 小电流接地系统 接地保护 故障选线 采样值差动保护 |
| 文章编号： | 1672-9331（2006）03-0078-06 |
| 收稿时间： | 2006-07-05 |
| 修稿时间： | 2006年7月5日 |
Single-phase grounding fault protection with sampled current difference between phases for ineffectively earthed distribution systems |
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| ZENG Xiang-jun,WANG Yuan-yuan,XIA Yun-feng,MU Da-qing.Single-phase grounding fault protection with sampled current difference between phases for ineffectively earthed distribution systems[J].Journal of Changsha University of Science and Technology:Natural Science,2006,3(3):78-83. |
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| Authors: | ZENG Xiang-jun WANG Yuan-yuan XIA Yun-feng MU Da-qing |
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| Institution: | College of Electrical and Information Engineering, Changsha University of Science and Technology, Changsha 410076, China |
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| Abstract: | Traditional ground fault protection has poor precision and reliability to detect arc-grounding fault in ineffectively earthed distribution systems because of small fault current.A novel grounding fault protection based on the sampled current difference between phases is presented in the paper. When the sampling number with the current difference bigger than its threshold is larger than a setting value,ground fault can be detected.The protector is also developed.And it has been verified by EMTP simulations and dynamic power system experimentations.Results show that the protection is free from the impact of arc-grounding faults,and has high sensitivity and reliability to protect all kinds of ground faults. |
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| Keywords: | ineffectively earthed distribution systems ground fault protection faulted feeder detection sampling value difference protection |
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