IEC 60034-18-31:2012 ED2

Rotating electrical machines - Part 18-31: Functional evaluation of insulation systems - Test procedures for form-wound windings - Thermal evaluation and classification of insulation systems used in rotating machines IEC 60034-18-31:2012 ED2

Publication date:   Jun 25, 2012

General information

60.60 Standard published   Jun 25, 2012


TC 2

International Standard

29.160.01   Rotating machinery in general



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IEC 60034-18-31:2012 describes thermal endurance test procedures for classification of insulation systems used in a.c. or d.c. rotating electrical machines with indirect cooling and form-wound windings. These test procedures are intended to compare the thermal endurance performance of the mainwall insulation between conductor(s) and ground and, where required by the design of the coil or bar, the insulation between the turns. The main technical changes with regard to the previous edition include:
- Definition of the test method and sub-cycles required to establish a consistent standardized platform for thermal ageing of insulation systems for form-wound windings.
- Recommendations for establishing a thermal life curve based on confidence intervals.
- Comparison of candidate and reference system performance for specific requirements of thermal class, within feasible limits.
Keywords: rotating machinery, insulation systems

Life cycle


IEC 60034-18-31:2012 ED2
60.60 Standard published
Jun 25, 2012


IEC 60034-18-31 ED3