Abstract
Submarine cables are widely used in submarine power grid systems, and the operating environment is complex and harsh. Anchor damage is the most fatal factor affecting the safe and stable operation of submarine cable lines. In this paper, the finite element analysis is used to study both the electric and magnetic field distribution of submarine cables to evaluate the degree of anchor damage. Process principles of the two working conditions, anchor drop and anchor drag, are considered and described respectively. In the simulation environment, the 2D finite element model of 110 kV single-core AC submarine cable is built, simulating the anchor damage through longitudinal compression and overall deformation of the stressed section. After solving the electric and magnetic field distribution of the insulation layer, the correlation between the electric field distribution, magnetic field distribution and the deformation degree of anchor damage are finally established. Results show that the deformation of submarine cables caused by anchor damage lead to uneven distribution of both electric field strength and magnetic flux density in the insulation layer. The compression of the cable in the stress direction results in the thickness reduction of the material, thus weakening its magnetic shielding ability. With the simulation conclusion, the internal electric and magnetic field contribution of the submarine cable insulation layer can be inferred according to the insulation deformation degree, which contributes to the status evaluation of the submarine cable after the anchor damage and further ensures the safety and reliability of submarine cable operation.
Published Version
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