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Explain BIL : Basic Insulation Level

BIL : Basic Insulation Level

It indicates the ability of the insulation of the equipment to withstand the electrical stresses

It is the combination of rated voltage, the corresponding impulse withstand voltage and corresponding power frequency withstand voltage which together categorize the insulation quality of the equipment

For the sake of convenience the rated insulation of a equipment is designated by rated voltage and impulse withstand voltage.
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