IEC 60034-27-3:2015

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

FOREWORD
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