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The installation in northern regions of new power plants and facilities presents certain unique problems due to the very low ambient temperatures. Many electrical insulating materials commonly used become glass like under extreme cold conditions. Insulating oils such as those used in cables and transformers present the risk of becoming highly viscous or solid at low temperatures. In oil impregnated...
The partial discharge properties of the cable model insulated with the cryogenic liquid impregnated tape were studied. As we confirmed that the breakdown strength of the paper-like single sheet sample in liquid was dependent on the permittivity ratio of liquid to fiber, the partial discharge inception stress in the butt gap of the cable was analysed using the permittivity ratio of the liquid to the...
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...
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