配网单相触树接地故障过渡电阻演变特性: 温度和含水率的影响

何建波; 周瑶; 柳明贤; 李祚朋; 彭涛; 和晓华; 沈雪明; 宁文军

何建波,周瑶,柳明贤,李祚朋,彭涛,和晓华,沈雪明,宁文军.配网单相触树接地故障过渡电阻演变特性: 温度和含水率的影响[J].电测与仪表,2026,63(3):104-113.
He Jianbo,Zhou Yao,Liu Mingxian,Li Zuopeng,Peng Tao,He Xiaohua,Shen Xueming,Ning Wenjun.Impact of temperature and tree moisture content on evolution characteristics of transition resistance of tree-contact single-phase-to-ground fault in distribution network[J].Electrical Measurement & Instrumentation,2026,63(3):104-113.

配网单相触树接地故障过渡电阻演变特性: 温度和含水率的影响

Impact of temperature and tree moisture content on evolution characteristics of transition resistance of tree-contact single-phase-to-ground fault in distribution network

DOI：10.19753/j.issn1001-1390.2026.03.011

中文关键词: 导线单相触树故障过渡电阻温度含水率

英文关键词:tree-contact single-phase-to-ground fault, transition resistance, temperature, moisture content

基金项目:云南电网有限责任公司丽江供电局科技项目（YNKJXM20222421）

作者中文名	作者英文名	单位
何建波	He Jianbo	云南电网有限责任公司丽江供电局
周瑶	Zhou Yao	云南电网有限责任公司丽江供电局
柳明贤	Liu Mingxian	云南电网有限责任公司丽江供电局
李祚朋	Li Zuopeng	四川大学(双一流）
彭涛	Peng Tao	云南电网有限责任公司丽江供电局
和晓华	He Xiaohua	云南电网有限责任公司丽江供电局
沈雪明	Shen Xueming	四川大学(双一流）
宁文军	Ning Wenjun	四川大学(双一流）

摘要点击次数: 432

中文摘要:

单相触树接地故障(tree-contact single-phase-to-ground fault,TSF)会威胁线路的稳定运行,严重时可能导致山火。温度和含水率是影响TSF 发展的重要因素,但它们影响故障的过程及机理尚不明确。文章以自然生长的松树为实验对象,开展了TSF 试验研究;基于实验数据,分析了温度及含水率对TSF 过程中树木过渡电阻的影响,并且建立了一种计及温度和树木含水率的TSF 过渡电阻等效模型。模型预测结果与实验测量结果的平均相对误差小于10%,验证了模型的有效性。结果表明:TSF 的电流加热会导致树枝内部水汽蒸发至树皮与树干之间的夹层,反过来影响泄漏电流流通路径,并在夹层上形成炭化通道;电流通道的局部加热和水汽蒸发导致的含水率变化是影响TSF 泄漏电流及过渡电阻变化的主要因素。改进后的模型降低了对传统经验参数的依赖,且与实验测量数据的匹配度更高,为进一步厘清故障发展的机理提供参考依据。

英文摘要:

The occurrence of tree-contact single-phase-to-ground fault (TSF) poses a potential threat to the stable operation of power lines, and in severe cases, may result in wild fire. The development of TSF is influenced by crucial factors such as temperature and moisture content; however, the precise process and mechanism through which they impact failure remain unclear. This paper takes naturally growing pine trees as the experimental object and conducts a TSF experimental study. Based on the experimental data, it analyzes the impact of temperature and tree moisture content on the transition resistance of trees during TSF, and establishes an equivalent model of TSF transition resistance that takes into account the temperature and the moisture content of trees. The average relative error between model prediction and experimental measurement is less than 10%, validating the effectiveness of the model. The results show that the current heating of TSF will cause the water vapor inside the branches to evaporate into the interlayer between the bark and the trunk, which in turn affects the leakage current flow path and forms a carbonization channel on the interlayer, the distribution of moisture content caused by local heating and water vapor evaporation in the current channel is the main factor affecting the leakage current and transition resistance changes of TSF. The refined model diminishes its reliance on traditional empirical parameters and boasts enhanced alignment with experimental measurement data, offering valuable insight into the mechanisms underlying fault progression.

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