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This paper summarizes the progress of an extensive study of the ac voltage endurance, extending from a single cycle to more than a year, for cast silica-filled epoxy resin, with recessed silver paint electrodes and cast-in aluminum electrodes, giving a nearly uniform electric field. Although the specimens were prepared to avoid gas cavities, and partial discharges were usually undetected, the ac strength...
Tests are described on lapped taped cable models impregnated with liquid nitrogen to investigate discharge activity and insulation life. A number of polymer materials are discussed with an emphasis on high density polyethylene. For all the polymers a life expectancy-stress relationship of the form t En = Constant is obtained. The exponent “n” is seen to be strongly dependent on the pressure of the...
The generation and transmission of electric power using equipment operating at cryogenic temperatures has been considered to be economically and technically feasible within ten to fifteen years. Cryogenic generators have the ad vantage of smaller size yielding greater generated power per unit volume. Superconducting or cryoresistive underground cables can transmit more power and with less losses than...
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