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This paper presents performance comparison of coconut oil as an alternative liquid insulation for transformer mineral oil during ageing and under simulated electrical and thermal fault conditions. In the ageing study, 6 wet coconut oil, 6 wet and 6 dry transformer oil samples were aged (each half as sealed and unsealed with inclusions of Cu, Al, Fe and Zn metal substances) inside an oven at 120°C...
We report on the glass transition dynamics and the conductivity properties of a nanodielectric system composed of pre-synthesized TiO 2 nanoparticles embedded in thermoplastic polyurethane. Increase of TiO 2 loading results in enhanced segmental mobility of the composites and less steep temperature dependence, i.e., lower fragility index. The decrease in the fragility index and glass...
In this paper we investigate the electrical properties of semiconducting tapes used for field grading applications in high voltage technology. Direct- and alternating-current resistance of the samples are measured at cryogenic temperatures between 18-300 K. Two different experimental setups are used due to the resistivity levels of the samples. It is observed that the samples have 'U-shaped' temperature...
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