BS EN 60034-27-3:2016
$142.49
Rotating electrical machines – Dielectric dissipation factor measurement on stator winding insulation of rotating electrical machines
| Published By | Publication Date | Number of Pages |
| BSI | 2016 | 32 |
This part of IEC 60034 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 International Standard applies to all kind of vacuum impregnated or resin-rich (fully-loaded) taped bars, coils and complete windings. It is not applicable to non-impregnated individual bars and coils or non-impregnated complete windings.
Requirements for the dielectric dissipation factor characteristics of individual form-wound stator bars and coils of machines with rating voltages from 6 kV and higher when tested with 50 Hz or 60 Hz alternating voltages are given.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 4 | European foreword Endorsement notice |
| 5 | Annex ZA (normative) Normative references to international publications with their corresponding European publications |
| 6 | English CONTENTS |
| 8 | FOREWORD |
| 10 | INTRODUCTION |
| 11 | 1 Scope 2 Normative references 3 Terms and definitions |
| 12 | 4 Theory and measuring techniques 4.1 Dielectric dissipation factor measurement Figures Figure 1 – Parallel circuit and vector diagram |
| 13 | Figure 2 – Series circuit and vector diagram |
| 14 | 4.2 Analogue Schering bridge Figure 3 – Dielectric losses with increasing voltage (schematic) |
| 15 | 4.3 Transformer ratio arm bridge Figure 4 – High voltage Schering bridge – Basic circuit |
| 16 | 4.4 Digital phase shift measurement Figure 5 – Transformer ratio arm bridge |
| 17 | 5 Test procedures 5.1 General Figure 6 – Schematic test set-up of a digital dissipation factor measuring system with principle current oscillogram |
| 18 | Figure 7 – Example of a curve of tan δ versus voltage ratio U/UN measured in voltage steps of 0,2 UN |
| 19 | 5.2 Winding bars and coils 5.2.1 Test object preparation 5.2.2 Guarding techniques |
| 20 | Figure 8 – Arrangement with guard rings electrodes on test objects with insulation gap (example of preferred insulation gap and guard ring electrode dimensions) |
| 21 | 5.2.3 Measuring procedure 5.3 Complete windings Figure 9 – Application of guard ring electrodes on top of stress control coating |
| 22 | 6 Test results 6.1 General |
| 23 | 6.2 Winding bars and coils Tables 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 UN = 21 kV |
| 24 | 6.3 Complete windings |
| 25 | 7 Test report 7.1 General 7.2 New coils, bars and winding |
| 26 | 7.3 Operational aged winding |
| 28 | Annex A (informative) Relationship between power factor and dissipation factor Figure A.1 – Phasor diagram |
| 29 | Table A.1 – Comparison between correlating values of dielectric power factorcos φ and dielectric dissipation factor tan δ and their difference |
| 30 | Bibliography |
