配电线路单相触树炭化蔓延特性分析
Characterisation of charring spread rate of single-phase contact trees in distribution lines
胡馨月 1孙章 1宁鑫 2王军1
作者信息
- 1. 西华大学 电气与电子信息学院,四川 成都 610039
- 2. 国网四川省电力公司电力科学研究院,四川 成都 610041
- 折叠
摘要
针对配电线路单相触树引燃贯穿问题,搭建真型试验平台进行触树炭化蔓延特性分析.首先,分析单相搭接树干引燃植被演变过程及其泄漏电流、电压、阻抗和温度特性,并界定了初始搭接、水分蒸发、明火蔓延、燃烧贯穿 4个发展阶段.然后,试验发现火焰在炭化痕迹上形成,进而分析了炭化蔓延贯穿速率对阻抗、电流变化的影响规律.最后,考虑自然生长植被粗细,研究得到山茶树直径由52.77 mm减小到30.17 mm时,蔓延速率升高了 119%;进一步从木材的电学性质(击穿场强)及热传导角度(热容量)揭示尺寸与蔓延速率呈负相关的机理.
Abstract
Aiming at ignition and penetration of single-phase tree-contract in distribution lines,a full-scale test platform is designed to analyze the spreading characteristics of tree-contract carboniza-tion.First,the evolution of single-phase lap trunk ignition vegeta-tion and its leakage current,voltage,impedance and temperature characteristics are analyzed,and the four development phases of initial lap,water evaporation,open flame spreading,and combus-tion penetration are defined.Then,the test found that the flame was formed on charring traces,and then analyzed the influence law of the charring spreading penetration rate on the impedance and current changes.Finally,considering the thickness of natu-rally growing vegetation,it was obtained that the spread rate in-creased by 119%when the diameter of Camellia sinensis was re-duced from 52.77 mm to 30.17 mm;further,the mechanism of negative correlation between size and spread rate was revealed from the electrical properties of wood(breakdown field strength)and heat conduction angle(heat capacity).
关键词
单相触树/演变过程/泄漏电流/等效阻抗/炭化蔓延/炭化痕迹Key words
single-phase tree-contract/evolutionary process/leakage current/equivalent impedance/charring spread/charring trace引用本文复制引用
基金项目
四川省自然基金重点项目(2022NSFSC0025)
四川省重点研发项目(2022YFG0117)
四川省重点研发项目(2022YFS0538)
出版年
2024
NETL
NSTL
万方数据