Page 136 - intelligent encyclopedia ( equipment issue 1 )

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• Isolation level

Isolation level For a primary voltage of 24 k. v. For a primary voltage of 12 k. v.

High voltage impulse withstand
voltage (BIL) (regulated impulse 125 k. v. 75 k. v.
voltage)

Power frequency withstand volt-
age (isolation level) (direction of 50 k. v. 28 k. v.
medium voltage)

Low voltage power frequency
withstand voltage (secondary 3 k. v. 3 k. v.
voltage)

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