IEC 60034-27-3:2015

Rotating electrical machines - Part 27-3: Dielectric dissipation factor measurement on stator winding insulation of rotating electrical machines

IEC 60034-27-3:2015 provides guidelines for the test procedures and the interpretation of test results for dielectric dissipation factor measurements on the stator winding insulation of rotating electrical machines. These guidelines are valid for rotating electrical machines with conductive slot coatings operating at a rated voltage of 6 kV and higher. This standard applies to individual form-wound stator bars and coils outside a core (uninstalled), individual stator bars and coils installed in a core and complete form-wound stator winding of machines in new or aged condition. This edition includes the following significant technical changes with respect to the previous publication IEC TR 60894:1987:
- inclusion of digital measurement of dissipation factor and capacitance;
- inclusion of limits for dissipation factor values;
- detailed description of measuring techniques; extension of scope to complete windings.

Machines électriques tournantes - Partie 27-3: Mesure du facteur de dissipation diélectrique sur le système d'isolation des enroulements statoriques des machines électriques tournantes

L'IEC 60034-27-3:2015 fournit des lignes directrices pour les procédures d'essai et l'interprétation des résultats d'essai concernant les mesures du facteur de dissipation diélectrique sur l'isolation des enroulements statoriques des machines électriques tournantes. Ces lignes directrices sont valables pour les machines électriques tournantes à revêtement d'encoche conducteur dont la tension assignée est supérieure ou égale à 6 kV. Cette norme s'applique aux barres et bobines de stator individuelles préformées situées à l'extérieur d'un noyau (non installées), aux barres et bobines de stator individuelles installées dans un noyau et aux enroulements statoriques préformés complets des machines à l'état neuf ou vieilli. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'IEC TR 60894:1987:
- intégration de la mesure numérique du facteur de dissipation et de la capacité;
- indication de valeurs limites pour le facteur de dissipation;
- description détaillée des techniques de mesure;
- extension du domaine d'application aux enroulements complets.

General Information

• Status: Published
• Publication Date: 15-Dec-2015
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.160.01 - Rotating machinery in general
• Technical Committee: TC 2 - Rotating machinery
• Drafting Committee: MT 10 - TC 2/MT 10
• Current Stage: PPUB - Publication issued
• Start Date: 15-Jan-2016
• Completion Date: 16-Dec-2015

Relations

• Replaces: IEC TR 60894:1987 - Guide for test procedure for the measurement of loss tangent of coils and bars for machine windings
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60034-27-3 ®
Edition 1.0 2015-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Rotating electrical machines –
Part 27-3: Dielectric dissipation factor measurement on stator winding insulation
of rotating electrical machines

Machines électriques tournantes –
Partie 27-3: Mesure du facteur de dissipation diélectrique sur le système
d’isolation des enroulements statoriques des machines électriques tournantes

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IEC 60034-27-3 ®
Edition 1.0 2015-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Rotating electrical machines –

Part 27-3: Dielectric dissipation factor measurement on stator winding

insulation of rotating electrical machines

Machines électriques tournantes –

Partie 27-3: Mesure du facteur de dissipation diélectrique sur le système

d’isolation des enroulements statoriques des machines électriques tournantes

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.160 ISBN 978-2-8322-3061-9

– 2 – IEC 60034-27-3:2015 © IEC 2015
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Theory and measuring techniques . 8
4.1 Dielectric dissipation factor measurement . 8
4.2 Analogue Schering bridge . 10
4.3 Transformer ratio arm bridge. 11
4.4 Digital phase shift measurement . 12
5 Test procedures . 13
5.1 General . 13
5.2 Winding bars and coils . 15
5.2.1 Test object preparation . 15
5.2.2 Guarding techniques . 15
5.2.3 Measuring procedure . 17
5.3 Complete windings . 17
6 Test results . 18
6.1 General . 18
6.2 Winding bars and coils . 19
6.3 Complete windings . 20
7 Test report . 21
7.1 General . 21
7.2 New coils, bars and winding . 21
7.3 Operational aged winding . 22
Annex A (informative) Relationship between power factor and dissipation factor . 24
Bibliography . 26

Figure 1 – Parallel circuit and vector diagram . 8
Figure 2 – Series circuit and vector diagram . 9
Figure 3 – Dielectric losses with increasing voltage (schematic) . 10
Figure 4 – High voltage Schering bridge – Basic circuit . 11
Figure 5 – Transformer ratio arm bridge . 12
Figure 6 – Schematic test set-up of a digital dissipation factor measuring system with
principle current oscillogram . 13
Figure 7 – Example of a curve of tan δ versus voltage ratio U/ U measured in voltage
N
steps of 0,2 U . 14
N
Figure 8 – Arrangement with guard rings electrodes on test objects with insulation gap
(example of preferred insulation gap and guard ring electrode dimensions) . 16
Figure 9 – Application of guard ring electrodes on top of stress control coating . 17
Figure A.1 – Phasor diagram . 24

Table 1 – Maximum values of dielectric dissipation factor of single bars and coils in
new condition with guard ring electrodes up to a rated voltage of U = 21 kV . 19
N
Table A.1 – Comparison between correlating values of dielectric power factor cos φ
and dielectric dissipation factor tan δ and their difference . 25

– 4 – IEC 60034-27-3:2015 © IEC 2015
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ROTATING ELECTRICAL MACHINES –

Part 27-3: Dielectric dissipation factor measurement on stator
winding insulation of rotating electrical machines

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