| 引用本文: | 邵文权,张爽,关欣,等.基于负序电压幅值差的配电网单相断线接地复合故障区段定位方法[J].电力系统保护与控制,2026,54(09):112-123. |
| SHAO Wenquan,ZHANG Shuang,GUAN Xin,et al.A section location method for compound single-phase open-circuit ground faults in distribution networks based on negative-sequence voltage amplitude difference[J].Power System Protection and Control,2026,54(09):112-123 |
|
| 摘要: |
| 针对配电网单相断线故障形态多样且缺乏显著电流特征，断线故障检测存在灵敏度低、误判率高等问题，提出一种利用负序电压幅值差特征的单相断线区段定位方法。首先建立单相断线故障多种形态的统一分析模型，解析单相断线位置处电源侧与负荷侧相电压、负序电压的关系。结果表明，在断线不接地、单侧接地及两侧接地（Rd＞5 Ω）等多种复杂断线接地故障场景下，电源侧负序电压接近 0，而负荷侧负序电压幅值大于 0.3 倍的正常电压。且仅有断线区段两侧负序电压幅值差异显著，而任意非故障区段两侧负序电压幅值基本一致。进一步利用配电变压器智能终端低压侧电压测量信息计算中压侧线路负序电压信息，构造基于相邻区段负序幅值差的断线接地复合故障区段定位方案。仿真结果表明，所提方法能够实现不同单相断线故障形态下断线接地复合故障区段的可靠定位。 |
| 关键词: 配电网 单相断线 负序电压 区段定位 馈线自动化 |
| DOI：10.19783/j.cnki.pspc.250754 |
| 分类号: |
| 基金项目:国家自然科学基金项目资助(52407137) |
|
| A section location method for compound single-phase open-circuit ground faults in distribution networks based on negative-sequence voltage amplitude difference |
|
SHAO Wenquan1, ZHANG Shuang1, GUAN Xin1, ZHANG Zhihua2, YANG Peng1, XU Weimin1
|
|
1. Xi'an Key Laboratory of Interconnected Sensing and Intelligent Diagnosis for Electrical Equipment, Xi'an Polytechnic University, Xi'an 710048, China; 2. Electric Power Research Institute of State Grid Shaanxi Electric Power Co., Ltd., Xi'an 710010, China
|
| Abstract: |
| To address the challenges of low sensitivity and high misjudgment rates in detecting single-phase open-circuit faults in distribution networks, due to their diverse fault forms and lack of distinct current characteristics, a section location method based on the magnitude difference of negative-sequence voltage is proposed. First, a unified analytical model for various types of single-phase open-circuit faults is established, and the relationships between phase voltages and negative-sequence voltages on the source side and load side at the breakage point are derived. The results show that under various complex fault scenarios, including open-circuit without grounding, single-side grounding, and double-side grounding (Rd＞5 Ω), the negative-sequence voltage on the source side is close to zero, while that on the load side exceeds 0.3 times of the normal voltage. Moreover, a significant difference in negative-sequence voltage magnitude exists only across the faulted section, whereas adjacent non-faulted sections exhibit nearly identical values. Based on this characteristic, the method further utilizes low-voltage side measurements from intelligent terminals of distribution transformers to estimate the medium-voltage line negative-sequence voltage. A fault section location scheme is then constructed using the magnitude differences of negative-sequence voltages between adjacent sections. Simulation results verify that the proposed method achieves reliable fault section localization under various compound single-phase open-circuit grounding fault conditions. |
| Key words: distribution network single-phase open-circuit fault negative-sequence voltage section location feeder automation |
