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Space charge effects in two different types of thermally aged oil-paper which are traditional mineral oil and synthetic ester MIDEL 7131 immersed paper, were tested and compared. The results show that a few days standing time between the ageing processes and following experiments are necessary to achieve water equilibrium. With thermal ageing conducted, more charges were injected into the oil-paper...
Space charge has been a general concern related with the reliability and the life-time of HVDC components. In this present work, the space charge profiles in oil-impregnated pressboards are investigated by the means of the pulsed electroacoustic (PEA) technique under AC voltage with 50 Hz at the room temperature. It has been observed that the ageing status of the mineral oil and the presence of the...
In this paper, space charge in oil-paper insulation system has been investigated using the pulsed electroacoustic (PEA) technique. A series of measurements were carried out when the insulation system was subjected to different applied voltages. Charge dynamics in the insulation system during the volts-on, volts-off and decay have been analyzed. It has been found that homocharge injection occurred...
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