Multi-factor Aging Weighted Analysis and Comprehensive Performance Evaluation of EPDM for Torsion-Resistant-Cable

The problem of excessive carbon emissions is widely concerned by various countries in the world. In order to achieve the goal of "Carbon peaking and carbon neutralization", the development and utilization of clean renewable energy such as offshore wind energy has become a development trend. In view of the complexity of the marine environment, EPDM cable is widely used in the power transmission of offshore wind power units because of its excellent weather resistance. In this paper, UV aging, salt spray aging and temperature alternating aging are performed on EPDM samples to simulate the state changes of EPDM under ocean conditions. The electrical and mechanical properties of EPDM samples after aging are measured, and the internal aging mechanism is analyzed. Based on the experimental data, the Analytic Hierarchy Process (AHP) is modified and the weight analysis at two levels is done: The first is the weight analysis of performance parameters of a single aging factor. The weight of tensile strength and elongation at break under ultraviolet aging is the highest, which is 24.06% and 21.62%. The weight of volume resistivity under salt spray aging and temperature alternating aging is the highest, which is 23.05% and 30.75%. Then the influence weights of different aging factors on EPDM samples are calculated, in which the weight of ultraviolet aging is 64.3%, salt spray aging is 28.3%, and the weight of temperature alternating aging is 7.4%. It can be seen that UV irradiation has the greatest influence on the performance of EPDM. This study has important guiding significance for the long-term reliability evaluation of the insulation state of offshore wind cables.