地下排管多电缆线路分流对运行寿命的影响

Translated title of the contribution: Influence of redistribution circuit current in an underground cable trench on cable service life

Qiufang Li*, Chengke Zhou*, Hang Wang, Zhi Tian, Zhanran Xia, Meng Cheng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

There are a large number of concentrated cable lines in the underground exhaust pipe, and it is difficult to dissipate the heat, which results in the high operation temperature of cable. Excessive temperature will accelerate the aging of the cable insulation and reduce the service life of the cable. In order to extend the average service life of cables in an underground cable trench, the temperature field in an underground trench was simulated based on the finite element method; the average service life of cables in the trench was quantitatively assessed according to cable aging theory. The temperature of the highest temperature cable in the cable group was not allowed to exceed 90℃, and the total current of all the circuits in the trench should remain unchanged, so that an optimization model of reallocating the current in the cable group was established to extend average service life of cables. The results of practical applications reveal that, compared with the results without redistribution at all, the average service life of the cables in the redistribution optimization program is increased by 14.9 years and the conductor core temperature of cable with the highest temperature in summer is reduced by almost 29.7℃; compared with the results of the current distribution program, the average service life of the cables in the redistribution optimization program is increased by 3.0 years and the conductor core temperature of cable with the highest temperature in summer is reduced by almost 2.7℃, which verify the effectiveness of the method. The proposed optimization method can be used to guide maintenance engineers when plans and designs are required to redistribute currents among cables in an underground trench, which can limit the operating temperature and extend average service life of cables. © 2019, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
Translated title of the contributionInfluence of redistribution circuit current in an underground cable trench on cable service life
Original languageChinese (Simplified)
Pages (from-to)1576-1583
Number of pages8
JournalGaodianya Jishu/High Voltage Engineering
Volume45
Issue number5
DOIs
Publication statusPublished - 31 May 2019

Keywords

  • Cable group
  • Cable redistribution
  • Life assessment
  • Optimization method
  • Pipe laying
  • Temperature field

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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