DS DS/EN 61857-21
DS DSEN 61857-21 2009-AUG-25 Electrcal nsulaton systems - Procedures for thermal evaluaton - Part 21 Specfc requrements for general-purpose models - Wre-wound applcatons
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This part of IEC 61857 describes a general-purpose model (GPM) and a tall channel alternative model (GPM-TC) which can be used for the evaluation of wire-wound electrical insulation systems (EIS) where specific electrotechnical products are not available or required.