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Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
That's interesting, Tony, but did you mean to include fig10.1b and fig10.1c as well?
From what I can see in fig 10.1a, it seems to go against what I've read elsewhere, specifically, that by dividing the secondary into six equal pancakes, and by dividing the primary into seven pancakes, the two outer pancakes with one turn, and the other five with two turns each, I can significantly reduce leakage inductance from what is shown in fig10.1a as a 'pie winding'.
EDIT: I've also read that a well designed transformer should have between 1-3% leakage inductance. (Although some, for example, constant current welding transformers, are designed to have much more, and to even have adjustable leakage inductance)
Registered Member #3700
Joined: Sat Feb 19 2011, 12:59PM
Location:
Posts: 107
yes, small low voltage tranformers the leakage is about 1-3%. 15kV distribution tx in the range of 10-500kVA is about 5-7%, tranformer station 88-220kV tx the lekage is about 8-12% But stick welding machines the leakage could be 80%.
And some switching PS requires a transfomer with some leakage. ( maybe in the end you will need add some leakage ...) One way to fake and adjust the proper leakage is adding a small inductor in series with primary. You can see a 5uH inductor in the ARC STARTER posted some time ago in this forum.
The factor that increase the leak is the distance between the coils.
In the post next I will try to attache the pics, I hope you can read.
Registered Member #1938
Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701
For me creating a disk shaped coil, using a dc motor , a pvc pipe and some epoxy worked well. If you need to see the project log, it is available here:
No calculations done, just a trial based construction, that proved both robust (vs hv) and easy to build.
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Anyone know a commercial source for HV, HF transformer windings?
