基于电磁热多场耦合的直埋电缆导体温度与载流量计算

doi:10.3969/j.issn.1000-1158.2022.07.07

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Abstract In order to study the temperature and current carrying capacity of underground cable conductors and design reasonable cable laying methods, combined with the knowledge of heat transfer and using finite element analysis, a calculation model of electromagnetic thermal coupling for buried power cables is established, and the current carrying capacity of the model is calculated. The calculation result is compared and verified with the calculation result based on the IEC 60287 standard. The influence of cable laying depth, interphase distance, thermal backfill and phase sequence changes on the temperature and current carrying capacity of power cable conductors is discussed, and the degree of influence of different factors on the temperature and current carrying capacity of cable conductors is analyzed through multiple linear regression. The research results show that the cable laying method greatly affects the cable conductor temperature and ampacity. The greater the laying depth, the smaller the interphase distance, the smaller the thermal conductivity of the thermal backfill, the higher the cable conductor temperature, the lower the ampacity. The thermal conductivity of backfill has the most significant effect on the temperature and ampacity of the cable conductor, and the phase sequence has the smallest effect. Therefore, in the direct buried cable laying project, thermal backfill with high thermal conductivity should be used to enhance the heat dissipation effect of the cable, thereby ensuring the safe and economic operation of the cable.

Key words： metrology thermal circuit analysis model heat dissipation effect electromagnetic thermal coupling model cable layout multiple linear regression

Received: 07 April 2021 Published: 18 July 2022

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TB94

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	WANG Yan-nan
	LI Zheng
	YANG Peng-fei
	LIU Wei

Cite this article:

WANG Yan-nan,LI Zheng,YANG Peng-fei, et al. Calculation of Conductor Temperature and Ampacity of Directly Buried Cable Based on Electromagnetic Thermal Multi Field Coupling[J]. Acta Metrologica Sinica, 2022, 43(7): 877-884.

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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2022.07.07 OR http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2022/V43/I7/877

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