| 小电流接地配电网馈线单相接地故障零序阻抗特性分析 |
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| 引用本文： | 李纳纳,王宾. 小电流接地配电网馈线单相接地故障零序阻抗特性分析[J]. 电测与仪表, 2024, 61(6): 58-64 |
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| 作者姓名： | 李纳纳 王宾 |
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| 作者单位： | 山东理工大学电气与电子工程学院,清华大学电机系电力系统及发电设备安全控制和仿真国家重点实验室 |
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| 基金项目： | 国家重点研究发展计划项目(2017YFB0902800)；国家电网公司科技项目(SGTYHT/16-JS-198) |
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| 摘 要： | 文章以暂态零序特征为着眼点,从频域角度对小电流接地系统发生单相接地故障后的特性进行详细探讨。文章从线路入端零序阻抗这一随频率变化的特征量入手,深入挖掘了配电网系统中各馈线零序阻抗的阻抗特性,详细探讨了零序阻抗的幅值、相角随频率的变化规律,并针对不同的中性点接地方式以及线路是否健全加以分析,为更好得利用零序暂态信号,提高故障检测正确率夯实了基础。最后通过PSCAD搭建仿真模型验证了该特性。
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| 关 键 词： | 小电流接地 暂态 单相接地故障 零序阻抗 仿真 |
| 收稿时间： | 2021-03-25 |
| 修稿时间： | 2021-04-14 |
The analysis of zero sequence impedance characteristics of feeder in distribution system with neutral point non-effective grounding |
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| Li Nana and Wang Bin. The analysis of zero sequence impedance characteristics of feeder in distribution system with neutral point non-effective grounding[J]. Electrical Measurement & Instrumentation, 2024, 61(6): 58-64 |
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| Authors: | Li Nana and Wang Bin |
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| Affiliation: | College of Electrical and Electronic Engineering,Shandong University of Technology,State Key Lab of Control and Simulation of Power Systems and Generation Equipments(Dept of Electrical Engineering, Tsinghua University) |
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| Abstract: | Based on the transient zero sequence characteristics, this paper studies the zero sequence transient characteristics of low current grounding system in frequency domain. Starting from the characteristic variable of zero sequence impedance at the line inlet which changes with frequency, this paper deeply excavates the impedance characteristics of zero sequence impedance of each feeder in the distribution network system, discusses the variation law of amplitude and phase angle of zero sequence impedance with frequency in detail, and analyzes different neutral grounding modes and whether the line is sound or not, so as to make better use of zero sequence transient signal and improve fault diagnosis The correct rate of detection lays a solid foundation. Finally, a simulation model is built by PSCAD to verify the characteristics. |
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| Keywords: | low current grounding system，transient single-phase earth fault zero sequence impedance simulation |
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