| 引用本文: | 邵文权,刘一欢,程远,张志华,程畅.基于零序阻抗突变特征的谐振接地系统高阻接地故障选线方法[J].电力自动化设备,2021,41(11): |
| SHAO Wenquan,LIU Yihuan,CHENG Yuan,ZHANG Zhihua,CHENG Chang.Fault line selection method of grounding fault with high resistance in resonant grounding system based on intensive zero-sequence impedance characteristics[J].Electric Power Automation Equipment,2021,41(11): |
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| 摘要: |
| 针对配电网谐振接地系统高阻接地故障选线困难的问题，提出了一种利用消弧线圈并联电阻短时投入以增强线路零序阻抗特征的高阻接地故障选线方法。对发生单相接地故障时消弧线圈并联电阻投入前、后同一母线上的健全线路和故障线路的零序阻抗特征进行分析，由分析结果可知：任意健全线路在并联电阻投入前、后其零序阻抗基本保持不变，由线路自身对地电容阻抗构成；故障线路在并联电阻投入后零序阻抗减小，由所有健全线路、消弧线圈支路和并联电阻支路的并联等值阻抗构成。此外，综合考虑故障点电流的限幅要求和零序电压的启动要求分析了并联电阻的取值范围。利用消弧线圈并联电阻投入前、后线路零序阻抗的变化特征构造了故障选线判据，其能够适用于过渡电阻在3 000 Ω以内的高阻接地故障。利用MATLAB建模仿真，验证了所提故障选线方法的有效性。 |
| 关键词: 配电网 高阻接地故障 故障选线 零序阻抗 并联电阻 |
| DOI：10.16081/j.epae.202107028 |
| 分类号:TM77 |
| 基金项目:陕西省重点研发计划资助项目(2020GY-167)；西安市科技计划资助项目(2019-GXYD7.4) |
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| Fault line selection method of grounding fault with high resistance in resonant grounding system based on intensive zero-sequence impedance characteristics |
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SHAO Wenquan1, LIU Yihuan1, CHENG Yuan1,2, ZHANG Zhihua3, CHENG Chang1
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1.School of Electronics and Information, Xi’an Polytechnic University, Xi’an 710048, China;2.School of Electrical Engineering, Xi’an University of Technology, Xi’an 710048, China;3.Electric Power Research Institute of State Grid Shaanxi Electric Power Company, Xi’an 710110, China
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| Abstract: |
| In order to solve the difficulties of faulty line selection of grounding fault with high resistance in resonant grounding system of distribution network, it is proposed to enhance the zero-sequence impedance characteristics of the line by using the short-time switching of resistance connected in parallel with arc suppression coil. In the case of single-phase grounding fault, the zero-sequence impedance characteristics of the healthy and faulty lines on the same bus before and after switching the parallel resistance are analyzed. The analysis shows that the zero-sequence impedance of any healthy line remains unchanged before and after switching the parallel resistance, which is composed of its own capacitance impedance to ground, while the zero-sequence impedance of the faulty line decreases significantly after the parallel resistance is put into operation, which is composed of the parallel equivalent resistance of all the healthy lines, arc suppression coil branch and the parallel resistance branch. In addition, the range of parallel resistance is analyzed by considering the limiting requirements of fault current and the start-up requirements of zero-sequence voltage. Therefore, according to the change characteristics of zero-sequence impedance of the faulty line before and after switching the parallel resistance, an improved faulty line selection method is proposed, which can theoretically adapt to the grounding fault with high resistance that lower than 3 000 Ω. The effectiveness of the proposed method is verified by MATLAB simulation. |
| Key words: distribution network grounding fault with high resistance fault line selection zero-sequence impedance parallel resistance |
