利用光纤应变判断光电复合海缆锚害程度的有限元分析法

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Abstract Anchor damage accounted for more than 80% of the submarine cable mechanical failure. Different damage degrees can lead to leakage,ground,short circuit and broken fault. It is very important to find anchor damage and judge the damage degree. The finite element analysis method is proposed to judge the anchor damage by strain of optical fiber composite in submarine cable. The finite element model of a 110kV photoelectric composite submarine cable is established. The process of anchor damage to submarine cable is simulated and analyzed. The segmented time function of armored layer stress and fiber strain in anchor damage process is provided. The anchor damage degree is graded. The simulation results are verified by submarine cable model experiment. Results indicate that the aggravation of anchor damage can lead to increase of optical fiber strain. The anchor damage process can be represented by five piecewise functions and damage degree can be divided to three grades which according to three values of optical fiber strain as 0.12%,0.35% and 1.1%. The anchor damage degree to submarine cable can be judged by optical fiber strain measured by distributed optical fiber sensing technology.

Key words： Photoelectric composite submarine cable anchor damage optical fiber strain distributed optical fiber sensing finite element analysis

Received: 07 November 2013 Published: 22 January 2015

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