I.S. EN 60034-18-42:2017&A1:2020

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Machine terminal voltages arising from converter operation
5 Electrical stresses in the insulation system of machine windings
6 Voltage rating for Type II insulation systems
7 Stress factors for converter-fed Type II insulation systems
8 Qualification tests
9 Qualification of mainwall insulation system
10 Qualification of turn insulation
11 Qualification of the stress control system
12 Preparation of test objects
13 Qualification test procedures
14 Qualification test pass criteria
15 Routine test
16 Optional screening tests
17 Analysis, reporting and classification
Annex A (informative) Contributions to ageing of the mainwall insulation
Annex B (informative) Examples of circuits for impulse testing
Annex C (informative) Derivation of the short term endurance test voltage
Annex D (informative) Derivation of the impulse voltage insulation class for the machine insulation
Annex E (normative) Derivation of an IVIC in the absence of a manufacturer’s reference life line
Annex F (informative) Optional screening tests
Bibliography

This part of IEC 60034 defines criteria for assessing the insulation system of stator/rotor windings of single or polyphase AC machines which are subjected to repetitive impulse voltages, such as those generated by pulse width modulation (PWM) converters, and are expected to experience and withstand partial discharge activity during service.