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The developed DC space-charge life model has been used to investigate the effect of trap cross-sections and trapped charges on the aging process in polymers. The experiment was performed using a two-dimensional grid that consists of multiple squares with micro dimensions that are treated as isolated regions. This grid was used to represent the evolution of damage structures during the aging process...
Space charge behaviours are strongly linked to the electrical characteristics of dielectric materials. Large amounts of space charge in the insulation greatly contribute to the early aging and even electric breakdown. In general, the AC breakdown strength of an insulation is lower than that of DC breakdown strength. However, the limited results show that the amount of charge measured under AC condition...
Polyethylene is one of the widely studied polymeric insulation materials due to its application for cable insulation. One of the major issues related to polymeric materials is the easy accumulation of space charge which can cause local electric field distortion. This phenomenon is comprehensively studied under high voltage direct current (HVDC) stresses, but very rare under high voltage alternative...
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...
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