Method for evaluating aging of cross-linked polyethylene cable insulating material

The invention discloses a method for evaluating aging of a cross-linked polyethylene cable insulating material, which is used for solving the problem of providing a non-destructive and comprehensive evaluation method for monitoring the insulation aging degree. A method for evaluating aging of a crosslinked polyethylene cable insulating material comprises the following steps: respectively preparing a to-be-tested sample of the crosslinked polyethylene cable insulating material and a reference sample which is made of the same material and is not aged into slice samples, and carrying out scattering test on the slice samples by using X rays to obtain scattering intensity data; carrying out Porod transformation and Lorentz correction on the scattering intensity data to obtain a transition interface thickness li and a lamellar crystal long period L; the lamellar crystal thickness lc is obtained according to the melting peak temperature of the DSC curve; according to the transition interface thickness li, the lamell