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Dielectric breakdown strength correlation with time-to-failure during wet aging of XLPE-insulated cables

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4 Author(s)
Walton, M.D. ; BICC Cables Ltd., Wrexham, UK ; Bernstein, B.S. ; Thue, W.A. ; Smith, J.T., III

This paper reviews two sets of failure information, the GMTF (a parameter obtained from time-to-failure results) and GMBD stress (a parameter that is calculated from AC breakdown test results), and suggests a correlation. The test results were obtained from accelerated aging experiments on full-sized medium voltage cables in carefully controlled and monitored water-filled tanks. Results show that the ambient temperature AC breakdown strength for equivalently aged cables is influenced primarily by voltage stress during aging-not by the aging temperature. The AC breakdown strength on equivalently aged cables was also shown to decrease with reductions in the aging voltage at all aging temperatures

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Power Delivery, IEEE Transactions on  (Volume:14 ,  Issue: 3 )