Axial internal forces in power transformer active part elements under windings clamping, variation of temperature and insulating materials moisture content
The paper examines core type transformers in which windings clamping and magnetic system end yokes clamping is accomplished by means of the same yoke beams. With regard to forces of friction between the yoke beams and the yoke there were obtained expressions for internal forces in the active part el...
Gespeichert in:
| Datum: | 2014 |
|---|---|
| 1. Verfasser: | |
| Format: | Artikel |
| Sprache: | Russian |
| Veröffentlicht: |
Інститут енергетичних машин і систем ім. А. М. Підгорного Національної академії наук України
2014
|
| Schlagworte: | |
| Online Zugang: | https://journals.uran.ua/jme/article/view/31403 |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| Назва журналу: | Energy Technologies & Resource Saving |
Institution
Energy Technologies & Resource Saving| Zusammenfassung: | The paper examines core type transformers in which windings clamping and magnetic system end yokes clamping is accomplished by means of the same yoke beams. With regard to forces of friction between the yoke beams and the yoke there were obtained expressions for internal forces in the active part elements under variation of their temperature and insulating materials moisture content. Based on numerical analysis, there was studied influence of variation of active part elements temperature and insulating material moisture content upon the internal forces in windings. It was demonstrated, that internal axial forces in windings reduce after clamping as the transformer cools to room temperature. Subsequent heating in operation compensates for this drop. Windings clamping forces may reduce to dangerous levels during shipment at low temperatures causing the windings to shift due to accelerations. If left for a prolonged period in a relatively humid environment, the windings in the active part may build high internal axial forces due to moisture content increase in insulation materials causing damage to the clamping structure. |
|---|