IEC 60034-18-21-2012 Rotating electrical machines - Part 18-21: Functional evaluation of insulation systems - Test procedures for wire-wound windings - Thermal evaluation and classification

Language: English, French
International Standard IEC 60034-18-21 has been prepared by IEC technical committee 2: Rotating machinery.
This second edition cancels and replaces the first edition published in 1992, and its amendments 1 (1994) and 2 (1996), and constitutes a technical revision.
The main technical changes with regard to the previous edition can be seen in the introduction of some basic statistical methods in the evaluation of comparative data. Moreover, the standard states a simpler use of different test procedures.Scope
This part of IEC 60034 gives test procedures for the thermal evaluation and classification of insulation systems used or proposed for use in wire-wound alternating current (a.c.) or direct current (d.c.) rotating electrical machines.
The test performance of a candidate insulation system is compared to the test performance of a reference insulation system with proven service experience.
IEC 60034-18-1 describes general testing principles applicable to thermal endurance testing of insulation systems used in rotating electrical machines. The principles of IEC 60034-18-1 are followed unless otherwise stated in IEC 60034-18-21.