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Insulation characterization in multistress conditions by accelerated life tests: An application to XLPE and EPR for high voltage cables

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3 Author(s)
Mazzanti, G. ; Dept. of Electr. Eng., Bologna Univ., Italy ; Montanari, G.C. ; Simoni, L.

This paper focuses on accelerated testing procedures that can be applied to XLPE and EPR for high voltage cables and that are aimed to achieve the thermo-electrical endurance characterization of insulation. Several methods and techniques for single and combined thermo-electrical stress are illustrated; indices for the evaluation of electrical, thermal, and multi-stress endurance are reported and their derivation is shown. Indications on the feasibility of the design-stress inference from tests on laboratory specimens also are given. Experimental results mainly refer to cable models, but data relevant to full-sized cables, as well as to simple, flat specimens, are also considered.

Published in:

Electrical Insulation Magazine, IEEE  (Volume:13 ,  Issue: 6 )