Basic Insulation Level

Definition: A design voltage level for electrical apparatus that refers to a short duration (1.2 x 50 microsecond) crest voltage and is used to measure the ability of an insulation system to withstand high surge voltage.

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BIL or Basic Insulation Level Definition Table and Calculation
What Is The Basic Insulation Level (BIL) | EEP
What is the meaning of the basic insulation level BIL? – Quora
Basic insulation level for a 22 kV system – Electrical Engineering Stack Exchange

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