10 kV线路山火桥接条件下火焰电气特性研究  

Study on flame electrical characteristics of 10 kV line under the condition of mountain fire bridge

作　　者：曾毅 王孟 杨皓涵 陈天翔 吴驰 Zeng Yi;Wang Meng;Yang Haohan;Chen Tianxiang;Wu Chi(College of Nuclear Technology and Automation Engineering,Chengdu University of Technology,Chengdu Sichuan 610059,China;Electric Power Science Research Institute of Sichuan Electric Power Company of State Grid,Chengdu Sichuan 610041,China)

机构地区：[1]成都理工大学核技术与自动化工程学院,四川成都610059 [2]国网四川省电力公司电力科学研究院,四川成都610059

出　　处：《消防科学与技术》2025年第2期276-281,共6页Fire Science and Technology

基　　金：国家自然科学区域创新发展联合基金重点支持项目(U19A2080);四川省科技计划(2023NSFSC0830);四川省电力公司科技项目(521903230001)。

摘　　要：近年来,输配电线路走廊山火事故频发,严重威胁电网稳定运行,给消防安全带来极大考验。为研究10 kV配电线路下山火全桥接条件下空气间隙泄漏电流的特性,开展了不同植被山火条件下12 cm导线-板间隙放电特性试验,分析了配电线路的故障信号特征,试验研究了不同植被山火条件下间隙泄漏电流的峰值特性和间隙等效阻抗,对比不同电容电流对泄漏电流的峰值特性和间隙等效阻抗及对工频泄漏电流和故障相电压之间相位的影响。结果表明,线路对地电容电流由1 A增大到3 A时,不同植被火焰泄漏电流的峰值降低;稻草条火焰泄漏电流峰值受到电容电流的影响程度最大,下降幅度为34.8%;灰分含量是影响稻草条火焰条件下间隙击穿的主要因素;火焰条件下导线-板间隙稻草火焰阻抗特性表现为感性,杉树枝树线接触时树木阻抗表现为纯电阻特性。研究结果可为通过线路电气信号预警山火和分析事故原因提供技术参考。In recent years,wildfire accidents in transmission and distribution line corridors have occurred frequently,seriously threatening the stable operation of power grids and presenting a great challenge to fire safety.To study the characteristics of air gap leakage current under the full bridge connection condition of mountain fires on 10 kV distribution lines,discharge characteristic tests of a 12 cm wire-plate gap under different vegetation mountain fire conditions were carried out.The fault signal characteristics of distribution lines were analyzed.The peak characteristics of gap leakage current and gap equivalent impedance under different vegetation mountain fire conditions were experimentally studied.The influence of different capacitive currents on the peak characteristics of leakage current and gap equivalent impedance and on the phase between power frequency leakage current and fault phase voltage was compared.The results show that when the line-to-ground capacitive current increases from 1 A to 3 A,the peak value of leakage current of different vegetation flames decreases.The peak value of leakage current of straw strip flame is most affected by capacitive current,with a drop of 34.8%.Ash content is the main factor affecting gap breakdown under straw strip flame conditions.Under flame conditions,the impedance characteristic of straw flame in the wire-plate gap is inductive,and when cedar branches are in contact with power lines,the tree impedance shows pure resistance characteristics.The research results can provide technical references for warning mountain fires through line electrical signals.

关 键 词：配电线路 山火 电容电流 电气特性 事故预警 

分 类 号：X913.4[环境科学与工程—安全科学] TM75[电气工程—电力系统及自动化]