Improved thermal analysis for three-core cable under unbalanced three-phase loads

Hu R.; Liu G.; Wang P.Zeng H.Xu Z.Ye W.

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Improved thermal analysis for three-core cable under unbalanced three-phase loads

机译：Improved thermal analysis for three-core cable under unbalanced three-phase loads

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? 2022For the three-core cable widely used in medium voltage system, the phenomenon of three-phase unequal load is common. However, the accepted thermal rating method for three-core cable, i.e. IEC 60,287, was proposed based on the assumption of three-phase equal load. Especially for the calculation of thermal resistance of irregular filler layer in IEC 60,287, it was conducted on the basis of the symmetric cable temperature distribution which was not tenable in the case of three-phase unequal load. The applicability of method for the case of three-phase unequal load was not specialized in IEC 60,287. Moreover, this issue has not been sufficiently addressed in the current literatures either. In this paper, the error analysis for the conventional three-core cable thermal rating method under three-phase unequal load was conducted. It was found that the existing calculation method of thermal resistance of filler layer was no longer applicable. Then, based on the discussion for the internal temperature distribution characteristics of three-core cable under three-phase unequal load, an improved thermal rating method for three-core cables was proposed. In the improved method, the modified calculation for the thermal resistance of filler layer considering the asymmetry of temperature distribution was included. The precision of the improved method was verified by the real cable experiments. The results show that the improved method can well reflect the inherent temperature difference of the three-phase cable's conductors under three-phase unequal load. The improved method is instructive for increasing the utilization of the three-phase cables, which is useful for the management and operating of the medium voltage cable lines.

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来源
《Electric Power Systems Research》 |2023年第3期|1-10|共10页
作者
Hu R.; Liu G.; Wang P.Zeng H.Xu Z.Ye W.;
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作者单位

School of Electric Power Engineering South China University of Technology||Shenzhen Power Supply Bureau Co. Ltd.;

School of Electric Power Engineering South China University of Technology;

Shenzhen Power Supply Bureau Co. Ltd.Shenzhen Yidian Power Co. Ltd.;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类
关键词
Filler layer; Thermal rating method; Thermal resistance; Three-core cable; Three-phase unequal load;

Improved thermal analysis for three-core cable under unbalanced three-phase loads

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