Comparison of Conductor-Temperature Calculations Based on Different Radial-Position-Temperature Detections for High-Voltage Power Cable

Lin Yang, Weihao Qiu, Jichao Huang, Yanpeng Hao, Mingli Fu, Shuai Hou and Licheng Li
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Lin Yang: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Weihao Qiu: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Jichao Huang: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Yanpeng Hao: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Mingli Fu: Electric Power Research Institute, China Southern Power Grid, Guangzhou 510080, China
Shuai Hou: Electric Power Research Institute, China Southern Power Grid, Guangzhou 510080, China
Licheng Li: School of Electric Power, South China University of Technology, Guangzhou 510640, China

Energies, 2018, vol. 11, issue 1, 1-17

Abstract: In this paper, the calculation of the conductor temperature is related to the temperature sensor position in high-voltage power cables and four thermal circuits—based on the temperatures of insulation shield, the center of waterproof compound, the aluminum sheath, and the jacket surface are established to calculate the conductor temperature. To examine the effectiveness of conductor temperature calculations, simulation models based on flow characteristics of the air gap between the waterproof compound and the aluminum are built up, and thermocouples are placed at the four radial positions in a 110 kV cross-linked polyethylene (XLPE) insulated power cable to measure the temperatures of four positions. In measurements, six cases of current heating test under three laying environments, such as duct, water, and backfilled soil were carried out. Both errors of the conductor temperature calculation and the simulation based on the temperature of insulation shield were significantly smaller than others under all laying environments. It is the uncertainty of the thermal resistivity, together with the difference of the initial temperature of each radial position by the solar radiation, which led to the above results. The thermal capacitance of the air has little impact on errors. The thermal resistance of the air gap is the largest error source. Compromising the temperature-estimation accuracy and the insulation-damage risk, the waterproof compound is the recommended sensor position to improve the accuracy of conductor-temperature calculation. When the thermal resistances were calculated correctly, the aluminum sheath is also the recommended sensor position besides the waterproof compound.

Keywords: power-cable insulation; sensor position; thermal resistance; finite element method; temperature measurement; experiment (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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