| Z型变在中性点经小电阻接地电网中的应用 |
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| 引用本文： | 贺春,刘力军,谢颂果,李伟. Z型变在中性点经小电阻接地电网中的应用[J]. 电力系统保护与控制, 2006, 34(14): 15-19 |
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| 作者姓名： | 贺春 刘力军 谢颂果 李伟 |
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| 作者单位： | 天津高压供电公司 天津300171(贺春，谢颂果)，河北经贸大学信息技术学院 河北石家庄050000(刘力军)，北京送变电公司 北京102401(李伟) |
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| 摘 要： | 接地变最大的功能就是创造了一个中性点用来连接接地电阻,使不接地系统能够将中性点集聚的多余电荷快速地释放掉,从而限制了内部过电压倍数。系统经接地变接地后,装设的接地保护对零序电流具有足够的灵敏度,为快速切除接地故障提供了可能性。从Z型变结构特点入手,讨论了中性点不接地系统经Z型变及小电阻接地后限制间歇性弧光过电压的原理,Z型变主要安装形式,Z型变及接地电阻选型。并讨论了经Z型变接地后,反映系统单相接地的保护配置,以及对主变压器差动保护的影响及对策。
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| 关 键 词： | Z型变 小电阻 接地 接地保护 电力系统 |
| 文章编号： | 1003-4897(2006)14-0015-05 |
| 收稿时间： | 2006-01-05 |
| 修稿时间： | 2006-04-04 |
Application of zigzag grounding transformers in the power system with low resistance via neutral grounding |
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| HE Chun, LIU Li-jun, XIE Song-guo, LI Wei. Application of zigzag grounding transformers in the power system with low resistance via neutral grounding[J]. Power System Protection and Control, 2006, 34(14): 15-19 |
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| Authors: | HE Chun LIU Li-jun XIE Song-guo LI Wei |
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| Affiliation: | 1. Tianjin High Voltage Power Supply Company, Tianjin 300171 ,China; 2. Information and Technology College, Hebei University of Economics and Business, Shijiazhuang 050000, China; 3. Beijing Electric Power Transmission and Transformation Company, Beijing 102401, China |
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| Abstract: | This paper introduces the characteristic of configuration of zigzag grounding transformers.Based on that,the mode of zigzag grounding transformers the in distribution network with low resistance via neutral grounding is presented.It analyzes the principle of the mode limiting overvoltage due to intermissive arc grounding,the mounting position of zigzag transformers and arrangement principle of earth protection in the distribution network.Moreover,the influence to tansformer differential protection in this mode is discussed and some countermeasures are proposed. |
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| Keywords: | zigzag transformer low resistance grounding earth protection power system |
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