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Pu F class insulation varnish
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Why do transformers need electric insulation?

In power transformers, insulation systems are fluid (either liquid or gas) and solid components. Since 1886 and the mid-1970s, when the flammability of mineral oil was an issue, petroleum-based lubricants have been used to insulate power transformers. Still, it has since been phased out of transformer production due to environmental concerns. Any of several high-flash-point...