NDLI: Calculation of ampacity of underground cables under humidity migration conditions

Content Provider	IEEE Xplore Digital Library
Author	Meng Gao Tonglei Wang Can Guo Tao Wen Yuan Li Qiaogen Zhang Weizheng Zhang Hui Lin Yuehao Yan Jun Xin Wei Bao
Copyright Year	2015
Description	Author affiliation: Sch. of Electr. Eng., Xi'an Jiaotong Univ., Xi'an, China (Meng Gao; Tonglei Wang; Can Guo; Tao Wen; Yuan Li; Qiaogen Zhang) \|\| ZhengZhou Power Supply Co., Zhengzhou, China (Weizheng Zhang; Hui Lin; Yuehao Yan; Jun Xin; Wei Bao)
Abstract	This paper presents a new approach for the determination of buried cable ampacity, considering the humidity migration in soil caused by the temperature rising around cables, and compares calculated results with migrationless considerations. To optimize the utilization of current carrying capacity, accurate calculation of real-time ampacity is needed in case of buried cable transmission systems, which is dependent on analysis of thermal field under application environment. The heat generated from the long-running buried cables can possibly drive away the moisture contained in the soil in the direction of temperature gradient. What's more, the decrease of moisture content could reduce the thermal conductivity of the soil around cables, which distinctively lessens the current carrying capacity of cables. Hence, the ampacity of buried cables could drop with time thanks to the coupling of heat and moisture in soil. This paper presents a new model to calculate the ampacity of buried cables, which has taken the humidity migration in soil into account. Complementary laboratory measurements show that the calculation model proposed in the paper (Model II) is more refined, compared with IEC standards (Model I). When factors like depth of laying, surface wind velocity and environment temperature varies, the calculation results of Model I is smaller and its trends distinctively differ from Model II, which matches the practice better.
Starting Page	995
Ending Page	998
File Size	800217
Page Count	4
File Format	PDF
ISSN	21609241
e-ISBN	9781479989034
DOI	10.1109/ICPADM.2015.7295442
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-07-19
Publisher Place	Australia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Power cables Mathematical model Soil Integrated circuit modeling Heating Wind speed Heat transfer Runge-Kutta iteration ampacity buried cables humidity migration
Content Type	Text
Resource Type	Article

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