In order to obtain the temperature change of the three-core fiber composite submarine cable overload operation condition

the finite element of three-core cable section and the section of the land sea model are established respectively.The feasibility of the model is verified by ANSYSY simulation.120%

140%

160%

180% and 200% of the carrying capacity are applied to the land and submarine cable model.It shows that the land cable model first reaches the highest ratio of submarine cable temperature 90 ℃.We also provide the emergency time in different load conditions.When the three-core cable overload in the lower case

the emergency time period in the submarine is longer than that in the landing area.The emergency time difference becomes smaller with the increase of load value.Our investigation provides a reference value for overload operation by the optical fiber sensing monitoring cable.