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Pre-compressed pressboard was commonly used in power transformers along with mineral oil. Pressboard in combination with mineral oil is suitable composite insulation for oil filled transformers over several decades. Synthetic ester is a suitable alternative for mineral oil due to its biodegradable and fire resistant property. It is also compatible for transformer insulations as per recent research...
Partial Discharge (PD) activity at the interface of oil pressboard begins before full surface discharge. It is visualized as white marks or tree like structures on the surface of aged pressboards. The PD activity can cause irreversible damage to the insulation material due to its thermal and chemical actions. Thus, extensive study is necessary to classify the PD patterns within oil, inside the pressboard...
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