1. VARS – The Vange Amateur Radio Society 1 A presentation by: Steve, G0KVZ 30 th July 2009

2. VARS – The Vange Amateur Radio Society 2 Early power generation and distribution was using d.c. See: http://en.wikipedia.org/wiki/War_of_Currents

3. VARS – The Vange Amateur Radio Society 3 P = I R 2 The distribution of power at low voltages leads to large losses

4. VARS – The Vange Amateur Radio Society 4 time Amplitude Scientists started to experiment with a.c. electricity

5. VARS – The Vange Amateur Radio Society 5 The price of copper makes large gauge cables costly Large gauge cables would require substantial pylons

6. VARS – The Vange Amateur Radio Society 6 a.c. generation and distribution soon established the transformer

7. VARS – The Vange Amateur Radio Society 7 Left hand rule - MotorsRight hand rule - Generators

8. VARS – The Vange Amateur Radio Society 8 ? A number of variations, but two basic types of device

9. VARS – The Vange Amateur Radio Society 9 Simple bobbins are easiest to wind

10. VARS – The Vange Amateur Radio Society 10 Video Of Linear Winding

11. VARS – The Vange Amateur Radio Society 11 Fly winding techniques

12. VARS – The Vange Amateur Radio Society 12 Whiteboard description

13. VARS – The Vange Amateur Radio Society 13 Standard transformers need the core to be applied after winding

14. VARS – The Vange Amateur Radio Society 14 Video Of Laminating Machine

15. VARS – The Vange Amateur Radio Society 15 Ferrite is an alternative core material

16. VARS – The Vange Amateur Radio Society 16 “C” Core transformers

17. VARS – The Vange Amateur Radio Society 17 Each pass through the centre of the core counts as one turn

18. VARS – The Vange Amateur Radio Society 18 Magnetic flux Leakage flux Secondary Winding Primary Winding Secondary Winding Negligible leakage flux due to lack of gaps in torus. Similarities and differences

19. VARS – The Vange Amateur Radio Society 19 Toroids often require more work in terminating & finishing

20. VARS – The Vange Amateur Radio Society 20 Video Of Toroidal Winding

21. VARS – The Vange Amateur Radio Society 21 Video Of Toroidal insulation machine

22. VARS – The Vange Amateur Radio Society 22 Advantages of Toroidal designs

23. VARS – The Vange Amateur Radio Society 23 All types of transformer require environmental protection

24. VARS – The Vange Amateur Radio Society 24 Some examples of different construction styles

25. VARS – The Vange Amateur Radio Society 25 Video Of Spring winding

26. VARS – The Vange Amateur Radio Society 26 Design considerations

27. VARS – The Vange Amateur Radio Society 27 configuration

28. VARS – The Vange Amateur Radio Society 28 Modification

29. VARS – The Vange Amateur Radio Society 29