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What is basic impulse insulation level? And how it is calculated for sub-
station?
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Answer Posted / 7anoter4
IEEE Std 141/1993 ch. 6.3.2 "Insulation tests and ratings"
specifies:
"Electrical power and distribution apparatus assigned a
given insulation class should be capable of withstanding,
without flashover or apparent damage, a 1.2/50 full-wave
impulse test of specified crest kV. This specified crest
voltage is the basic impulse insulation level (BIL) of the
equipment."
The BIL is not calculated but is stated by standards.
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