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Understanding the long term electrical degradation of polymeric insulation is of great importance in extending the life of high voltage cable insulation. Space charge is thought to play a significant role and the behaviour and energy dissipations of charge carriers within polymeric materials are of continued interest. Electroluminescence (EL) is an alternative method of investigating the charge at...
The electrical resistivity of (Ba 0.69 Pb 0.31 )TiO 3 PTCR ceramic thermistors aged at temperatures of 175, 200, 250 and 300°C, respectively, were measured. When the samples were aged at temperatures of 175 and 200°C, room-temperature resistivity decreased at the initial ageing stage, and then increased with the ageing time. The samples displayed a monotonous rise of the room-temperature...
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