Exciting current of Extended-Delta Transformer?
Exciting current of Extended-Delta Transformer?
(OP)
I am interested in seeing differences in excitation current of a standard transformer (Delta or Wye primary)to that of an extended delta unit.
Additionally I want to investigate any differences between a 3-leg transformer and a 5-legged unit under inrush and short circuit conditions.
If you haven't guessed yet I'm tasked to evaluate a 5-legged, extended delta primary transformer under inrush.
Anybody that might have a waveform capture or a useful link it would be appreciated!
Thank you in advance for your support.
Regards,
Jim
Additionally I want to investigate any differences between a 3-leg transformer and a 5-legged unit under inrush and short circuit conditions.
If you haven't guessed yet I'm tasked to evaluate a 5-legged, extended delta primary transformer under inrush.
Anybody that might have a waveform capture or a useful link it would be appreciated!
Thank you in advance for your support.
Regards,
Jim






RE: Exciting current of Extended-Delta Transformer?
RE: Exciting current of Extended-Delta Transformer?
It is a delta primary with "teasers" to provide a phase shift on the primary for rectifier transformers. In my case, a 7.5 degree shift is obtained.
A picture is worth a thousand words, so i have atatched one to look at.
RE: Exciting current of Extended-Delta Transformer?
My understanding is that it is a delta-wound transformer but the delta connection is formed by connecting the end of one winding to (say) the 80% tapping of the next winding. The lines are connected at the 100% tapping. The transformer produces a phase shift which is somewhat dependant on the tapping at which the delta is formed. They usually turn up in high power rectfiers with high pulse counts - 24 and upward.
The star-delta dual of the extended delta design is the zig-zag or inter-star transformer.
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RE: Exciting current of Extended-Delta Transformer?