IEC 61857-22 pdf download.Electrical insulation systems – Procedures for thermal evaluation 1 Scope This part of IEC 61857 specifies an encapsulated-coil model (ECM) that can be used for the evaluation of encapsulated wire-wound EIS. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references,...