Abstract

Electrical and material characteristics of 93 aged XLPE (cross-linked polyethylene) cables removed from the field after 2 approximately 19 years of service were measured. It was confirmed that breakdown strengths under AC, DC, and impulse voltages in such cables decrease with length of service. Tan delta , which increases with length of service, shows a strong correlation with breakdown strength. Tan delta increases with carbonyl group content in the insulation layer and with maximum length of the bow-tie tree. The maximum length of the bow-tie tree also increases with length of service and shows a strong correlation with breakdown strength. >

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