Negative Heat Capacity: Inapplicable IEC Standard to High-voltage Cable with Large Cross-sections

Wen, Jiajia; Zhang, Han; Wang, Xiaofeng; Qiu, Canshu; Yang, Gang; Zeng, Yanqi; Zhong, Huihuang; Liu, Gang

doi:10.1109/ceepe58418.2023.10166440

Cited by 1 publication

(1 citation statement)

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“…In recent years, with the promotion of renewable energy and the increase in electric energy demand, the load volatility of urban transmission lines has been intensified, the average load has increased continuously, and the peak time has been continuously extended [1][2][3][4]. This has led to an urgent need to improve the ampacity of existing distribution cables.…”

Section: Introductionmentioning

confidence: 99%

Research on the Improvement of Cable Ampacity in Dense Cable Trench

Zhang,

Yu,

Liu

et al. 2024

Energies

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Due to the influence of many factors, distribution cables are often densely placed at the bottom of the cable trench. As a result, it is easy for distribution cables to become the thermal bottleneck of the whole transmission line. To address this dilemma, this paper establishes a finite element simulation model of a cable trench to analyze the hot spots of cables with different arrangements in the cable trench. Then, the model’s accuracy is verified based on real temperature rise experiments. For an arrangement with overheating risk, the ampacity improvement method of filling the cable trench with high-thermal-conductivity material was proposed, and the ampacity improvement effect under different filling ratios was assessed. Finally, combined with the analysis of economic benefit and cost, the method of determining the optimal filling ratio was used, and the impact resistance of the cables under the impact of new energy load was analyzed. The results indicate that, for the case of the optimal filling ratio, the cables in the dense cable trench showed superior impact resistance. The investigations in this paper make significant contributions to the promotion of the maximum utilization of cables.

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Section: Introductionmentioning

confidence: 99%