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Accelerated cable life testing of EPR-insulated medium voltage distribution cables

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5 Author(s)
Walton, M.D. ; BICC Cables Corp., Scottsville, TX, USA ; Bernstein, B.S. ; Smith, J.T., III ; Thue, W.A.
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This paper presents results aimed at developing a reliable accelerated aging tank test for EPR-insulated cables. Aging was performed at 2 to 4 times rated voltage on load cycling to temperatures of 45°C, 60°C, 75°C, and 90°C at the conductor with water in the conductor strands and outside the cable. Results show that cable failure is more rapid at the highest electrical stress and lowest conductor load cycle temperature. Cables aged at higher temperatures and various levels of electrical stress rarely failed and retained in excess of 40% of their original breakdown strength after 1500+ days of aging. Aging performed at 90°C load cycle temperature and 4 times rated voltage with air on the outside and water at the conductor of the cable showed more rapid loss of life than with water outside. Results indicate the optimum aging conditions for EPR-insulated cables in the accelerated cable life test (ACLT) differ significantly from those previously observed for XLPE-insulated cables, and that the appropriate test methodology for EPR-insulated cables requires additional study

Published in:

Power Delivery, IEEE Transactions on  (Volume:9 ,  Issue: 3 )

Date of Publication:

Jul 1994

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