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- W2466970951 abstract "The objective of this study was to seek to develop a reliable aging model of extruded cables. From a review of existing theories and experimental data, it is deduced that the rate theory, modified to take into account some elements of the Zhurkov and Zeller theories, could describe the electrical aging of extruded cables. The proposed model relies on two physical parameters: {Delta}G{sup 0} and {lambda}, the free energy and the width of the barrier controlling aging. The model predicts that at high fields there is a linear relation between electric field and the log of time-to-breakdown. In this regime, aging appears to be irreversible and it is possibly associated with changes in the nature of the insulation; this has to be verified. Below a given critical field, the breakdown field does not vary linearly with the log of time-to-breakdown. It was verified that the proposed model describes the published voltage endurance results for HMW-PE, XLPE and the EPR cables aged in air and water. The influence of air, water, temperature and polymer nature on the values of {Delta}G and {lambda}{sub max} was briefly discussed. A critical field above which the time-to-breakdown increases exponentially with the applied electric field wasmore » observed insome cases. Morphology changes were also observed in laboratory samples electrically aged at fields higher than the critical field. In its present from, the model allows the determination of the value of the critical field from the low field limit of the exponential regime. Various materials can also be compared from the values of {Delta}G{sub 0} and {lambda}{sub max} determined from high field endurance results.« less" @default.
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- W2466970951 date "1992-12-01" @default.
- W2466970951 modified "2023-09-22" @default.
- W2466970951 title "Aging of extruded dielectric power cables: Theory. Final report" @default.
- W2466970951 hasPublicationYear "1992" @default.
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