| 引用本文: | 唐 瑞,张文海,杨淳岚,等.基于阻抗渐变特性检测的中压线路树枝碰线故障识别方法[J].电力系统保护与控制,2025,53(03):148-159.[点击复制] |
| TANG Rui,ZHANG Wenhai,YANG Chunlan,et al.Tree-contact single-phase-to-ground fault identification for medium voltage distribution lines based on impedance gradient property detection[J].Power System Protection and Control,2025,53(03):148-159[点击复制] |
|
| 摘要: |
| 中压配电线路的树枝碰线故障极易诱发森林火灾并造成严重安全事故，灵敏准确地识别树枝碰线故障对于保障供电安全和公共安全有重要意义。基于澳大利亚“植被引燃测试”的树枝碰线公开实验数据，针对树枝碰线引起的单相接地故障，在分析碰线至树枝引燃全物理过程的基础上，发现95%以上树枝碰线故障在初期存在相似的阻抗渐变过程。树枝阻抗因放电升温呈现双指数衰减特性，并进一步提出基于双指数曲线拟合的阻抗渐变特性检测识别方法。基于PSCAD/EMTDC仿真数据、公开实验数据集和真型实验测试数据对所提方法进行验证。结果表明，所提方法可适用于不同中性点接地方式、不同类型树种的快速准确识别，为树枝碰线故障识别提供了新的思路。 |
| 关键词: 树枝碰线故障 阻抗渐变特性 最小二乘拟合 非线性识别 |
| DOI：10.19783/j.cnki.pspc.240252 |
| 投稿时间：2024-03-05修订日期：2024-07-17 |
| 基金项目:四川省自然科学基金项目资助(2022NSFSC0234)；国家自然科学基金项目资助(52307125) |
|
| Tree-contact single-phase-to-ground fault identification for medium voltage distribution lines based on impedance gradient property detection |
| TANG Rui1,ZHANG Wenhai1,YANG Chunlan1,2,CHEN Tianxiang2 |
| (1. College of Electrical Engineering, Sichuan University, Chengdu 610065, China; 2. College of Nuclear Technology
and Automation Engineering, Chengdu University of Technology, Chengdu 610059, China) |
| Abstract: |
| A tree-to-wire fault (TF) in medium voltage distribution lines can cause wildfires and serious safety accidents. Sensitive and accurate TF identification is of great significance in ensuring power supply and public safety. Based on the publicly available experimental data of the “Vegetation Conduction Ignition Tests” in Australia, for tree-contact single-phase-to-ground fault (TSF), an analysis of the entire physical process from contact to fire ignition reveals that over 95% of TSF exhibit a similar impedance gradient pattern in the initial stage. The tree impedance shows a double exponential decay characteristic due to discharge heating. Also a method for detecting and identifying impedance gradient properties based on double exponential curve fitting is proposed. The proposed method is validated using PSCAD/EMTDC simulation data, public experimental datasets, and real experimental test data. The results show that the proposed method can be quickly and accurately applied to different neutral grounding methods and types of tree species, providing a new approach for identifying TSF. |
| Key words: tree-contact single-phase-to-ground faults (TSF) impedance gradient property least squares fitting nonlinear identification |
