Effect of testing parameters on the outcome of the accelerated cable life test

The effects of various testing parameters on the accelerated life test results of 15 kV underground residential distribution cables prepared from thermoplastic and crosslinked polyethylene insulation are considered. Testing parameters included dry versus water in the strand, voltage stresses 4X(34.6 kV) and 3X(26.0 kV), and hot spot temperatures of 90 and 75 degrees C. The effect of shelf aging on the life of crosslinked polyethylene insulation is reported. Microscopic examinations were made for a number of the tested samples, and tree observations are discussed. The data presented provide insight to a number of the factors which reduce the life of polyethylene cable insulation used in the URD applications.<
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