Method for evaluating degassing effect of cross-linked polyethylene cable

A method for evaluating a degassing effect of a cross-linked polyethylene cable, comprising:

• acquiring a to-be-tested cable sample which is a hollow cross-linked polyethylene cable insulated wire core with an insulating layer and an inner shielding layer;
• heating the to-be-tested cable sample to obtain a transparent to-be-tested cable sample with a transparent insulating layer;
• acquiring at least one light spot image of the transparent to-be-tested cable sample formed by irradiation under a monochromatic laser light source under a darkroom condition;
• extracting light intensity data of the at least one light spot image within a preset light spot image range;
• performing normalization processing on the light intensity data to obtain a relationship between a thickness of the insulating layer and a normalized light intensity coefficient;
• acquiring a maximum value and an average value of normalized light intensity coefficients of the transparent to-be-tested cable sample within a preset thickness range of the insulating layer according to the relationship between the thickness of the insulating layer and the normalized light intensity coefficient;
• calculating a degassing uniformity coefficient according to the maximum value and the average value;
• and
• obtaining an evaluation result of the degassing effect of the cross-linked polyethylene cable according to the maximum value, the average value, and the degassing uniformity coefficient.