scope:

This section of IEC 60034-18 is a technical report that describes test procedures for evaluation of multifactor endurance of insulation systems in those cases where both thermal and electrical ageing factors are significant. The procedures are intended for insulation systems used, or proposed to be used, in a.c. electrical machines using form-wound windings up to and including 50 MVA and 15 kV. The test procedures are comparative in nature, so that the performance of a candidate insulation system is compared to that of a reference insulation system with proven service experience. The evaluation described in this technical report does not include stress grading.