CR4® - The Engineer's Place for News and Discussion®

 Previous in Forum: Blowing of 200 Amp D.O.Fuse (33KV) Next in Forum: Servo Getting Hot
Anonymous Poster #1

# Regular Delta-Wye Transformer VS -30 Degree Phase Shift Transformer

10/03/2012 3:00 PM

True or false?

"A regular delta-wye transformer (probably most common type TX in low voltage distribution ) provides a phase shift between primary and secondary of +30° WHEREAS a Harmonic mitigation transformer like the Type THR 30-Degree Phase Shift by Eaton provides phase shift between primary and secondary of -30 °."

I am working on a harmonic mitigation scheme that uses NEG -15° phase shift , POS +15 ° phase shift , NON (or zero) ° phase shift and +30° phase shift transformers. The calculations look good on paper but i want to make sure i can get +30° and -30° shifts. I know -15° and +15° are commercially available.

Interested in this topic? By joining CR4 you can "subscribe" to
Guru

Join Date: May 2009
Location: Richland, WA, USA
Posts: 20068
#1

### Re: Regular Delta-Wye Transformer VS -30 Degree Phase Shift Transformer

10/04/2012 1:59 AM

I forget which is which, but I think vector group 1 or 11 does this (the numbers give lead or lag in 30° increments, just like a clock).

__________________
In vino veritas; in cervisia carmen; in aqua E. coli.
Guru

Join Date: Aug 2010
Location: Resting under the Major Oak
Posts: 4278
#2

### Re: Regular Delta-Wye Transformer VS -30 Degree Phase Shift Transformer

10/04/2012 6:17 AM

Dyn11 = -30°

Dyn1 = +30°

Spot on Tornado with the clock face

__________________
The reports of my death are greatly exaggerated.
Guru

Join Date: Oct 2009
Posts: 2029
#3

### Re: Regular Delta-Wye Transformer VS -30 Degree Phase Shift Transformer

10/06/2012 11:43 AM

Incorrect!

Dyn 11 is + 30 degree

Dyn1 is - 30 degrees

Anonymous Poster #1
#4

### Re: Regular Delta-Wye Transformer VS -30 Degree Phase Shift Transformer

10/09/2012 11:26 AM

Well it seems i got good answers. Does any of you know why Eaton uses THR to describe their -30 phase shifting transformers?

What does THR stand for?

Thank you guys.

Guru

Join Date: Oct 2009
Posts: 2029
#5

### Re: Regular Delta-Wye Transformer VS -30 Degree Phase Shift Transformer

10/09/2012 1:07 PM

Total Harmonic Reduction....?????

Anonymous Poster #1
#6

### Re: Regular Delta-Wye Transformer VS -30 Degree Phase Shift Transformer

10/09/2012 2:17 PM

your guess is as good as...no, it is better than mine.

Interested in this topic? By joining CR4 you can "subscribe" to

Anonymous Poster (2); electricalexpert65 (2); TonyS (1); Tornado (1)

 Previous in Forum: Blowing of 200 Amp D.O.Fuse (33KV) Next in Forum: Servo Getting Hot