Assessment Study of Aging Life for Typical Defects in XLPE Cable Joints

摘要

To evaluate the aging life of cross-linked polyethylene (XLPE) cables with typical joint defects, three typical cable joint defect models were made for 10kV cables, namely scratch defects, air gap defects, and creeping defect. Firstly, using the conventional method, based on the change of XLPE elongation at break in the aging process, combined with the Arrhenius equation, the aging life under the specific conditions of the cable is derived, and then the experimental data of the step-by-step pressure is compared with the life result to obtain the life of the selected cable. The index is finally calculated by engineering empirical formula to calculate the aging life of the cable with joint defects. At voltage 10kV and temperature 85°C, the aging life of the three defect types is 18.1a, 23.2a and 25.1a, and the cable is produced for different defect types. The differential experimental results were analyzed.