| 阶梯式不接地电网单相接地故障分析及保护实现 |
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| 引用本文： | 丁网林,温传新,骆健.阶梯式不接地电网单相接地故障分析及保护实现[J].江苏电机工程,2010,29(4):12-15,19. |
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| 作者姓名： | 丁网林 温传新 骆健 |
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| 作者单位： | 国网电力科学研究院南京中德保护控制系统有限公司,江苏,南京,210003 |
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| 摘 要： | 分析了阶梯式供电中性点不接地系统中的零序电流特性，详细阐述了在级联线路发生区内外单相接地故障时流过线路两端的零序电流。指出传统的接地保护原理的不足。提出了基于线路两端零序差流与时端零序电流方向判别的接地保护原理。通过试验和现场运行情况表明了该保护原理的可行性。
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| 关 键 词： | 不接地电网 单相接地保护 多级供电 零序差流 |
Realization About Single-phase Ground Protection of Ladder Ungrounded Distributed Power System |
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| DING Wang-lin,WEN Chuan-xin,LUO Jian.Realization About Single-phase Ground Protection of Ladder Ungrounded Distributed Power System[J].Jiangsu Electrical Engineering,2010,29(4):12-15,19. |
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| Authors: | DING Wang-lin WEN Chuan-xin LUO Jian |
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| Affiliation: | (State Grid Electric Power Research Institute Nanjing Sino-German Protection ＆ Substation Control Systems Ltd., Nanjing 210003, China) |
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| Abstract: | The characteristics of zero sequence current in ladder ungrounded distributed power system are discussed. The zero sequence currents of two sides in connection line are analyzed in detail when line internal and external single-phase ground fault occurrence. The shortage of traditional single-phase ground fault protection principle is pointed out. The new principle is proposed based on the direction relation between zero sequence currents of two sides in connection line and the direction relation between zero-sequence differential current and zero sequence currents. The test and site operation results show the superiority of this technology. |
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| Keywords: | ungrounded power grid single-phase ground protection multi-level power supply zero-sequence differential current |
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