主管：中华人民共和国应急管理部
主办：应急管理部天津消防研究所
ISSN 1009-0029  CN 12-1311/TU
消防科学与技术

消防科学与技术 ›› 2023, Vol. 42 ›› Issue (8): 1046-1050.

• • 上一篇    下一篇

单相触树接地故障引燃特性及模型分析

宁鑫1, 何鑫2, 王军2, 孙章2   

  1. （1. 国网四川省电力公司电力科学研究院，四川 成都 610041；2. 西华大学 电气与电子信息学院，四川 成都 610039）
  • 出版日期:2023-08-15 发布日期:2023-08-15
  • 作者简介:作者简介：宁 鑫(1986- )，男，国网四川省电力公司电力科学研究院高级工程师，博士，主要从事高电压与绝缘技术、输配电线路防山火等研究工作，四川省成都市郫都区西华大学，610039。
  • 基金资助:
    基金项目：国家电网有限公司科技项目资助（521997220001）

Single⁃phase contact tree ground fault ignition characteristics and model analysis

Ning Xin1, He Xin2, Wang Jun2, Sun zhang2   

  1. (1. State Grid Sichuan Electric Power Research Institute, Sichuan Chengdu 610041, China; 2. School of Electrical Engineering and Electronic Information, Xihua University, Sichuan Chengdu 610039, China)
  • Online:2023-08-15 Published:2023-08-15

摘要： 针对单相触树引燃植被进而引发森林火灾问题，为明确植被的引燃特性与温升机理，搭建试验平台对导线接触松木进行研究，分析导线触树引燃植被过程中的引燃现象与温度变化。分析发现植被引燃分为初始接触、水分蒸发、炭化通道、蔓延贯穿4个阶段；同时，泄漏电流受温度影响也呈现出明显的4个发展阶段特点；植被温度升高的热量来源于电流热效应与物体传热。根据热量作用途径与温升机理，提出计算燃点-时间的温升模型，对植被蔓延至不同位置的明火时间进行预测分析。验证结果表明，计算模型具有较高的准确性，对指导线路引发森林火灾防治工作具有重要意义。

关键词: 单相触树, 森林火灾, 引燃特性, 温升模型, 明火时间

Abstract: Abstract: For single?phase tree ignition of vegetation and thus forest fires, in order to clarify the ignition characteristics and temperature rise mechanism of vegetation, this paper laps the test platform to conduct a study of the wire contacting pine trees and analyze the ignition phenomenon and temperature change during the ignition of vegetation by the wire contacting the tree. The analysis found that the vegetation ignition is divided into four stages: initial contact, water evaporation, carbonization channel, and spreading through; meanwhile the leakage current is also affected by the temperature showing obvious characteristics of the four stages of development; the heat of the vegetation temperature rise comes from the thermal effect of the current and heat transfer from the object. Further, according to the heat action path and temperature rise mechanism, the temperature rise model of calculating ignition point?time is proposed to predict and analyze the open flame time of vegetation spreading to different locations. The validation results show that the calculated model has high accuracy and is important for guiding the prevention and control of forest fires started by wire.

Key words: single?phase contact trees, forest fires, ignition characteristics, temperature rise model, open fire time