隧道电缆载流量计算及其影响因素分析.pdf

第33卷第5期
电力科学与工程
Vol 33,No 5
2017年5月
Electric Power Science and Engineering
May,2017
doi:10.3969/j.ISSN.1672-0792.2017.05.011
隧道电缆载流量计算及其影响因素分析
李巍巍,候振奇,吴科2,张星海,甘德刚
(1.国网四川省电力公司电力科学研究院,四川成都610072
2.四川大学电气信息学院,四川成都610065
摘要:研究了某地区电缆隧道内110kV电缆实际运行情況下,不同排列方式对电缆載流量的影响。通过有
限元仿真软件建立了隧道内电缆温度场的三维有限元仿真模型,计算了水平和三角形两种不同排列方式下电
缆的温度场分布,对比分析了不同排列方式下的电缆戟流量大小,并通过电缆温升实验验证了仿真结果的可
靠性。结果表明:两种不同排列方式下电缆载流量大小存在明显差异,水平排列三相电缆載流量明显大于三
角形排列,其中水平排列时B相电缆栽流量提高5.0%,AC两相电缆载流量提高9.5%。基于以上发现
电缆隧道内高压电缆采用水平排列方式更利于改善电缆的温度场分布和提高电缆的传输功率。
关键词:电缆;排列方式;温度场;載流量
中图分类号:TM73
文献标识码:A文章编号:1672-0792(2017)05-0055-05
Ampacity Calculation for Cable in Cable Tunnel
and Its Influencing Factors
LI Weiwei, HOU Zhenqi, WU Ke", ZHANG Xinghai, GAN Degang
(1. State Grid Sichuan Electric Power Research Institute, Chengdu 610072, China
2. School of Electrical Engineering and Information, Sichuan University, Chengdu 610065, China)
Abstract: In the case of the actual operation of a 110 kv tunnel cable in a certain area, the influence of the different
arrangement modes on the ampacity of power cables was investigated. A simulation model is set up to calculate the tem-
perature field distribution for the tunnel cable by the finite element simulation software, and the ampacity of the power
cables with two kinds of arrangement modes is analyzed as well, and the reliability of the simulation model is also
proved through the cable temperaure rise experiment. The result shows that there are obvious differences between the
ampacity of power cables under two different arrangement modes. The ampacity of B phase cables is 5. 0% higher while
the ampacity of AC phases cables is 9. 5% higher than that of triangular arrangement. Based on the above findings
compared with the triangular arrangement, the horizontal arrangement of the high- voltage cable is of greater advantage
to better the temperature field distribution and improve the transmission power of the cable
Key words: cable; arrangement; temperature field; ampacity
重要参数。实际上,电缆载流量的影响因素很
多,很难准确获取电缆的实际载流量,載流量过
大会导致电缆导体温度急剧上升从而破坏电缆绝
随着我国城市电网改造速度的加快,高压电缘缩短电缆使用寿命。实际运行中为了保证电
力电缆逐步取代架空线路成为城市输配电的主要缆的安全,电力电缆加载的载流量远没有达到理
途径,电缆载流量是影响电力电缆安全运行的论设计值,通常为载流量的20%~30%,电力电
缆的利用率很低°们。
针对电缆载流量,国内外专家进行了诸多研
收稿日期:2016-12-12。
万方数据