光电复合海缆中光纤与导体温度关系的有限元分析方法

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Abstract It is essential to calculate the temperature of conductors according to the temperature of optical fibers in optic-electric composite submarine cable for monitoring the temperature of conductors and calculating current-carrying capacity. The finite element model of 110kV optic-electric composited submarine cable is established using finite element method in this paper. The thermal load is calculated according to IEC 60287 standard. The effect to temperature distribution of submarine cable and its periphery are analyzed because of different factors, such as load current, environment temperature and convective heat transfer coefficient between soil and seawater. The relational expression for temperatures of conductor, optical fiber and environment is established. Results indicate that, there is a linear relationship between temperatures of conductor and optical fiber. The temperature of optical fiber will rise 1℃ if the temperature of conductor rise 1.3℃. The temperature of conductor must fall 0.3℃ if environment temperature rise 1℃ with constant temperature of optical fiber. The heat from submarine cable is most spread to around soil of 1.6m diameter. The effect of convective heat transfer coefficient to results can be neglected. The temperature of conductor can be calculated according to temperatures of optical fiber and seawater, which can be regarded as the theoretical basis for monitoring the temperature of conductors and calculating current-carrying capacity.

Key words： Optic-electric composite submarine cable conductor temperature optical fiber temperature environment temperature finite element analysis

Received: 22 April 2012 Published: 27 June 2014

PACS:	TM247
	TN818

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