In order to study the influence of aging degradation on signal propagation of medium voltage cable

the influence of dielectric parameters of key dielectric materials in the electromagnetic propagation of medium voltage cable

including the insulation material of cross-linking polyethylene and the semi-conductive shield material of cross linked polyethylene doped conductive carbon black composites

on the channel model after thermal aging is studied respectively. Firstly

a simulation model of medium voltage cable channel is set up by the distributed impedance network analysis

and the characteristic parameters of unaged state channel are obtained. Then

the variation of mechanical and electrical properties of XLPE insulating material and semi-conductive shielding material after accelerated thermal aging is studied. It is found that the dielectric constant and the loss increase after aging of XLPE

while the conductivity of semi-conductive shielding material decreases and the loss increases. Finally

the key parameters of the material before and after material aging are brought into the cable channel model to calculate the influence of aging deterioration on cable channel characteristic parameters

finding that the characteristic parameters decrease gradually with the extend of aging.