IEC 60034-18-31:2012
(Main)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
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 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
Machines électriques tournantes - Partie 18-31: Evaluation fonctionnelle des systèmes d'isolation - Procédures d'essai pour enroulements préformés - Evaluation thermique et classification des systèmes d'isolation utilisés dans les machines tournantes
La CEI 60034-18-31:2012 décrit les procédures d'essai d'endurance thermique pour la classification des systèmes d'isolation utilisés dans les machines électriques tournantes à courant alternatif ou continu, à refroidissement indirect et à enroulements préformés. Ces procédures d'essai permettent de comparer les performances d'endurance thermique de l'isolation principale entre le (ou les) conducteur(s) et la terre, et si requis par la conception de la bobine ou de la barre, l'isolation entre spires. Les principales modifications techniques par rapport à l'édition précédente sont les suivantes:
- Définition de la méthode d'essai et des sous-cycles requis pour établir une plate-forme normalisée et cohérente applicable au vieillissement thermique des systèmes d'isolation des enroulements préformés.
- Recommandations pour établir une courbe de durée de vie thermique fondée sur des intervalles de confiance.
- Comparaison des performances des systèmes candidats et de référence en fonction d'exigences spécifiques de classe thermique, dans des limites réalisables. Mots clefs: machines tournantes, systèmes d'isolation.
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IEC 60034-18-31 ®
Edition 2.0 2012-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
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
Machines électriques tournantes –
Partie 18-31: Evaluation fonctionnelle des systèmes d'isolation – Procédures
d'essai pour enroulements préformés – Evaluation thermique et classification
des systèmes d'isolation utilisés dans les machines tournantes
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IEC 60034-18-31 ®
Edition 2.0 2012-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
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
Machines électriques tournantes –
Partie 18-31: Evaluation fonctionnelle des systèmes d'isolation – Procédures
d'essai pour enroulements préformés – Evaluation thermique et classification
des systèmes d'isolation utilisés dans les machines tournantes
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX U
ICS 29.160 ISBN 978-2-83220-159-6
– 2 – 60034-18-31 © IEC:2012
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 General considerations . 8
3.1 Reference insulation system . 8
3.2 Test procedures . 8
4 Test objects and test specimens . 9
4.1 Construction of test objects . 9
4.2 Verification of effects of minor changes in insulation systems . 9
4.3 Number of test specimens . 9
4.4 Quality control . 9
4.5 Initial diagnostic tests . 10
5 Test procedures . 10
5.1 Thermal ageing sub-cycle . 10
5.2 Ageing temperatures and sub-cycle lengths . 10
5.3 Method of heating. 11
5.4 Thermal ageing of test objects . 12
6 Diagnostic sub-cycle. 12
6.1 Conditioning procedure . 12
6.1.1 General . 12
6.1.2 Mechanical conditioning . 12
6.1.3 Moisture conditioning . 13
6.2 Diagnostic tests . 13
6.2.1 Voltage withstand test . 13
6.2.2 Method . 14
6.2.3 Mainwall insulation test. 14
6.2.4 Turn insulation test . 14
6.3 Informative tests . 15
7 Reporting and functional evaluation of data from candidate and reference systems . 15
7.1 General . 15
7.2 Determining qualification . 15
7.2.1 Overview . 15
7.2.2 Case A: Qualification for the same class temperature and same
expected service life . 16
7.2.3 Case B: Qualification for the same class temperature and a different
expected service life . 17
7.2.4 Case C: Qualification for a different class temperature and same
expected service life . 18
7.2.5 Case D: Qualification for a different class temperature and different
expected service life . 19
7.2.6 Non-linearity of regression lines . 20
7.2.7 Reduced evaluation . 20
Annex A (informative) Example of test object (formette) construction . 22
Bibliography . 27
60034-18-31 © IEC:2012 – 3 –
Figure 1 – Candidate system qualified for the same thermal class and the same
expected service life . 17
Figure 2 – Candidate system qualified for the same thermal class and different
expected service life . 18
Figure 3 – Candidate system qualified for a different class temperature and the same
expected service life . 19
Figure 4 – Candidate system qualified for a different service life and different thermal
class from the reference . 20
Figure A.1 – Typical slot assembly . 23
Figure A.2 – Typical slot assembly . 24
Figure A.3 – Formette for testing DC armature coils . 25
Figure A.4 – Test fixture for rotor slot section . 26
Table 1 – Thermal classes . 10
Table 2 – Recommended temperatures and ageing sub-cycle exposure periods . 11
Table 3 – Conditions for qualification of candidate system . 16
– 4 – 60034-18-31 © IEC:2012
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
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
FOREWORD
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