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RESEARCH PAPER
Risk of power cables insulation failure due to the thermal effect of solar radiation
 
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Gdańsk University of Technology Faculty of Electrical and Control Engineering Narutowicza 11/12 str., 80-233 Gdańsk, Poland
2
Polish Academy of Sciences Institute of Fluid Flow Machinery Fiszera 14 str., 80-231 Gdansk, Poland
Publication date: 2020-06-30
 
Eksploatacja i Niezawodność – Maintenance and Reliability 2020;22(2):232–240
 
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ABSTRACT
Low-voltage, as well as high-voltage power cable lines, are usually buried in the ground. The ampacity of the power cables in the ground mainly depends on the thermal resistivity of the soil, which may vary in a wide range. A common practice in power cable systems performance is to supply them from a pole of an overhead line. If so, a section of the line is located in free air and can be directly exposed to solar radiation. In some cases, the ampacity of power cables placed in free air is lower than in the ground. Differences in ampacities can be very high if thermal resistivity of the soil is very low, and simultaneously solar irradiation of cables in air occurs. This paper presents the risk of power cables overheating and in consequence the risk of their failure, when part of the underground power cable line is placed in free air. Temperature distribution of cables in the air (with and without solar radiation) for various load currents is presented. Thermal endurance of power cables insulation, operating with the overheating, is estimated.
 
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eISSN:2956-3860
ISSN:1507-2711