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 (9): 1187-1191.

• • 上一篇    下一篇

220 kV高压电缆火灾传热及燃烧特性试验研究

于唯1, 屠越1, 仪涛2, 高飞1   

  1. （1. 国网江苏省电力有限公司南京供电分公司，江苏 南京 210009；2. 中国能源建设集团江苏省电力设计院有限公司，江苏 南京 211102）
  • 出版日期:2023-09-15 发布日期:2023-09-15
  • 作者简介:于 唯（1986- ），男，江苏南京人，国网江苏省电力有限公司南京供电分公司工程师，硕士，主要从事新型电力系统研究、建设与管理研究，江苏省南京市建邺区奥体大街1号，210019。
  • 基金资助:
    国网江苏省电力有限公司科技项目（J2021105）

Experimental study on combustion characteristics and heat transfer of 220 kV high-voltage cable Fire

Yu Wei1, Tu Yue1, Yi Tao2, Gao Fei1   

  1. (1. Nanjing Power Supply Company of State Grid Jiangsu Electric Power Co., Ltd., Jiangsu Nanjing 210019, China;2. Jiangsu Power Design Institute Company, China Energy Engineering Group, Jiangsu Nanjing 211102, China)
  • Online:2023-09-15 Published:2023-09-15

摘要： 为研究220 kV高压电缆火灾传热及燃烧特性，开展全尺寸火灾试验，记录高压电缆内部温度分布及燃烧现象，分析电缆线芯、交联聚乙烯、填充材料以及外护套温度传播过程。结果表明：220 kV高压电缆火灾电缆铜芯与挤包皱纹铝护套之间在燃烧过程中会出现空洞现象；高压电缆受热后，内部铜芯在纵向不同位置处的升温响应时间基本一致。此外，在电缆受热阶段，线芯、交联聚乙烯、填充材料以及外护套平均温度梯度分别为2.125、1.938、1.688、1.375 ℃/cm；在火灾持续阶段，由于交联聚乙烯的热导率较差，随其与火源距离的增加，温度变化存在明显的滞后现象，交联聚乙烯燃烧蔓延平均速度约为3.6 cm/min；高压电缆交联聚乙烯绝缘部分受热后会形成熔融物，并在电缆端口不断累积，当其所受重力大于表面张力后，将形成高温熔滴，极易引燃下方可燃物，具有更大的危险性。

关键词: 220 kV高压电缆, 电缆火灾, 热量传递, 燃烧特性

Abstract: In order to study the heat transfer mechanism and combustion characteristics of 220 kV high-voltage cables fire, a full-scale fire experiment was carried out. The internal temperature distribution and combustion phenomenon were recorded, and the longitudinal temperature propagation progress of cable cores, cross-linked polyethylene (XLPE), filler materials and outer sheaths were analyzed. The results show that: there will be voids between the copper core and the extruded corrugated aluminum sheath during the combustion progress. After the high-voltage cable was heated, the heating response time of the inner copper core at different longitudinal positions is basically the same. In addition, in the heating stage of the cable, the average temperature gradient of the core, cross-linked polyethylene,filling material and outer sheath is 2.125,1.938, 1.688 and 1.375 ℃/cm respectively. In the continuous stage of the fire, due to the poor thermal conductivity of XLPE, with the increasing distance from the fire source, there is an obvious hysteresis phenomenon in the temperature change, and the average speed of combustion spread of XLPE is about 3.6 cm/min. The XLPE insulation part of the high-voltage cable will melt when heated, and will accumulate at the cable end. When its gravity is greater than the surface tension, it will form high-temperature molten droplets, which are easy to ignite the combustibles.

Key words: 220 kV high-voltage cable, cable fire, heat transfer, combustion characteristic