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It is crucial to understand degradation factors under actual operation in the lifetime evaluation of the coil winding of transformer. Polyvinyl formal (PVF) wire is used in oil-immersed transformer. Main degradation factor is considered to be oxidation and damage of the insulation coating due to thermal stress and partial discharge (PD). This paper deals with electrical insulation performance evaluation...
Natural ester oils began to be implemented in higher voltage of power transformer in 2002. Gases generated by such oils need to be examined in order to anticipate the use of dissolved gas analysis (DGA) method to diagnose the presence of faults in natural ester filled transformer in service. This paper deals with an analysis of the gas generations of natural monoesters of different molecular structures...
Vegetable oil is considered as biodegradable insulating oil alternative recently. Palm fatty acid ester (PFAE) oil and 2H-O8 oil are palm based vegetable oil that have been considered as insulating oil. This paper discusses PFAE oil and 2HO8 behavior due to partial discharge (PD) occurrence compared to mineral oil. The comparison includes PD repetition number n, average PD charge qav, and generated...
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