三芯海底电缆中复合光纤与导体温度关系建模

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Abstract It is difficult to calculate the thermal resistant of filling layer within optical fiber in 3-core optical composite submarine power cable. The temperature relationship between optical fiber and conductor can not be established until the above problem is resolved. In this paper, the temperature at external diameter of filling layer was calculated using virtual thermal source and image method, based on the established thermal circuit of 3-core submarine power cable. Then the temperature at external diameter of armor layer was calculated. The thermal resistant between optical fiber and external diameter of armor layer was calculated according to Fourier heat transfer theory. The summation of thermal resistant between inner diameter of filling layer and external diameter of armor layer was acquired by shape factor method. Finally, the thermal resistant of filling layer within optical fiber was obtained, as the difference between the above summation and the thermal resistant. The temperature relationship equation between optical fiber and conductor was accordingly established based on thermal circuit. It is indicated the relationship between the temperatures of optical fiber and conductor in 3-core submarine power cable is linear. The temperature of optical fiber will rise 1℃ if the temperature of conductor rises 1.15℃. The temperature of optical fiber will rise 1℃ if the ambient temperature rises 7.7℃ with constant temperature of conductor. The temperature of conductor can be calculated according to temperatures of optical fiber and environment, which can be regarded as the theoretical basis for monitoring the temperature of conductor and calculating current-carrying capacity for 3-core submarine power cables.

Key words： 3-core submarine power cable thermal circuit thermal resistance of filling layer temperature of optical fiber temperature of conductor temperature of environment

Received: 22 August 2014 Published: 13 October 2016

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2016/V31/I18/59

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