Topic3/Design1
Designing mixed operation mode transformer,230V/115V, 10A in autotransformer and 230V/115V, 10A galvanic separated connection
Input parameters
| Input | Voltage | 230V, +-10%, 50/60Hz, sine wave |
| Wire | Cu, round, single insulated | |
| Output | Nominal output voltage | 115V, in autotransformer connection 115V, galvanic separated connection |
| Nominal output current | 10A, in autotransformer connection 10A, galvanic separated connection | |
| Wire | Cu, round, single insulated | |
| Steel | M19, alternate stacking, not annealed | |
| Tube | Type | Single section |
| Design | Insulation class | B, max. operating temperature 120C, |
| Ambient temperature | 40C |
Modifying the wire size from thermal point of view
Due to the fact that the program supports only the full load operation mode we need to compare the currents in both, full load and partial load operation mode (disconnected one of both 10A loads) and modify the wire size by hand in the segment Uoat-0.
In the full load operation mode the current Ix has amount of 0.348A (view 3. design page). If you disconnect the load of the galvanic separated winding the amount of the current Ix changes to 4.188A and the temperature rise from 60K to 112K (view design page 4)
Changing the wire size in the segment Uoat-0 from AWG 26 to AWG 20.5 the temperature rise can be set back to the amount of approx. 50K (view the last 2 design pages)
Design page 1
Design page 2
Design page 3
Design page 4
Design page 5
Design page 6
