TheBackShed.com

Home	JAQForum Ver 24.01
Log In or Join
Active Topics
Local Time 18:50 16 Jul 2025	Privacy Policy
Jump to

Notice. New forum software under development. It's going to miss a few functions and look a bit ugly for a while, but I'm working on it full time now as the old forum was too unstable. Couple days, all good. If you notice any issues, please contact me.

Forum Index : Windmills : Help with Star/Delta

Page 2 of 2

Author

Message

wind friend

Newbie

Joined: 01/05/2007
Location: Australia
Posts: 39

Posted: 12:27am 06 Oct 2008

Copy link to clipboard

Print this post

Hi Anyone

I was sitting down with the calculator and ended up confused.

In Star - at any instant I would have 10 coils in series. These coils have 50 turns of .55 mm square wire x 2 strands with a resistance of .15 Ohms. 10 Coils x .15 Ohms = 1.5 Ohms

In Delta - at the same instant I could have 5 coils of 100 turns of .55 mm square wire(to increase voltage)Each of these coils has resistance of .3 Ohms. 5 x .3 Ohms = 1.5 Ohms. But there is a second path through the other two phases.

So the total reistance is the reciprical of 1.5 Ohms + 3 Ohms.

So if the maths are correct (1/1.5) + (1/3) = 1/r total which in this case is 1 Ohm. Near as dammit.

Does this mean the overall resistance at an instant is lower in Delta even though the coils have twice the resistance?

Do I understand this correctly, would I need to increase my windings by the value of root 3 (1.73 ish)to get the same voltage from delta as star?

Wind Freind

Page 2 of 2

Print this page

To reply to this topic, you need to log in.