基于顶棚温度分布的变电站高压电缆沟道着火点辨识  

Identification of Ignition Point of High Voltage Cable Channel in Substation Based on Ceiling Temperature Distribution

作　　者：段玉兵 姚金霞 马国庆 李鹏飞 秦佳峰 张皓 宋志平 DUAN Yubing;YAO Jinxia;MA Guoqing;LI Pengfei;QIN Jiafeng;ZHANG Hao;SONG Zhiping(Electric Power Research Institute of State Grid Shandong Electric Power Company,Jinan 250002,China;School of Electrical Engineering,Shandong University,Jinan 250061,China)

机构地区：[1]国网山东省电力公司电力科学研究院,济南250002 [2]山东大学电气工程学院,济南250061

出　　处：《高压电器》2023年第3期171-178,共8页High Voltage Apparatus

基　　金：国网山东省电力公司科技项目(52062619001F,52062619001K);山东省重点研发计划(公益性科技攻关类)(2018GGX103048)。

摘　　要：变电站高电压电缆沟道环境的封闭性强,难以从沟道外判断电缆火灾早期发展状况。为了探测沟道内电缆火灾,研究火灾早期顶棚温度分布与电缆着火点位置之间的关系,以变电站高压电缆沟道为模型,开展电缆火灾燃烧实验,测量电缆沟道内温度的分布变化,分析顶棚温度距离着火点位置变化的拟合关系,验证了着火点辨识方法的准确性。研究结果表明,顶棚最大温升比例系数α的平均值为17.71,1∶1高压电缆沟道实验平台的温度测量结果准确;在纵向方向上,顶棚温度由着火点位置向两侧递减,温度变化曲线具有明显的阶段特点;在长度为5 m的着火点辨识范围内,实验1和实验3的顶棚温度变化拟合函数拟合度分别为0.90和0.83,计算结果与着火点实际位置误差最大值分别为0.371 m和0.165 m,辨识准确率平均值分别为92.6%和96.9%。在变电站电缆沟道火灾早期,基于顶棚温度分布的变电站高压电缆沟道两点测温着火点辨识方法,有效辨识了着火点在沿电缆沟道纵向方向上的位置。The environment of high voltage cable channels in substations is so closed that it is difficult to judge the early development of cable fire from outside the channel. In order to detect the cable fire in the channel and study the relationship between the temperature distribution of the ceiling in the early stage of the fire and the location of the cable fire point,this paper takes the high-voltage cable trench of substation as the model,carries out the cable fire combustion experiment,measures the distribution change of the temperature in the cable trench,analyzes the fitting relationship between the ceiling temperature and the location change of the ignition point,and the accuracy of the ignition point identification method is verified.The results show that the average value of the maximum temperature rise ratio coefficient α of the ceiling is 17.71,so the temperature measurement results of 1∶1 high voltage cable channel experimental platform are accurate.In the longitudinal direction,the ceiling temperature decreases from the ignition point to both sides,and the temperature curve has obvious stage characteristics. In the range of 5 m in length,the fitting degrees of the fitting function of the ceiling temperature change in Experiment 1 and Experiment 3 are 0.90 and0.83,respectively,the maximum error between the calculated results and the actual position of the ignition point is 0.371 m and 0.165 m respectively,and the average identification accuracy is 92.6% and 96.9% respectively.In the early stage of substation cable trench fire,the two-point temperature measurement ignition point identification method of substation high-voltage cable trench based on ceiling temperature distribution can effectively identify the location of the ignition point along the longitudinal direction of the cable trench.

关 键 词：变电站高压电缆 电缆火灾 温度分布 着火点 辨识 

分 类 号：TM63[电气工程—电力系统及自动化] TM75