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Old 26th Mar 2020, 9:23 pm   #13
trobbins
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Join Date: Oct 2009
Location: Melbourne Australia
Posts: 901
Default Re: Three phase transformer

Quote:
Originally Posted by trobbins View Post
If you energise two adjacent legs equally and in phase addition, then I'd expect the third limb to effectively have no flux through it. With 230V on two windings in phase addition, the flux level in each energised limb is about 15% more than rated.
I mucked that up. If the two outer limb windings were energised, the flux from each would take the shortest path through the centre limb and effectively cancel in that limb.
A 40A DC output from a typical delta secondary with full-bridge rectifier would have each secondary winding rated for about 33A. But not sure about a wye secondary design.
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