Help needed ( 3-phase transformer connections )

  • Thread starter Serena_hm
  • Start date
  • #1
18
2
hello there ; I have several questions about the 3-phase transformer connections and I will be really grateful if any one could help ....

I've learnt that there are several types of 3-phase transformer connections which are in general ; the (Wye-wye) , ( Wye-Delta ) , (Delta-Delta ) , ( Delta-Wye ) , and Open Delta

but I got a bit confused with the VA relation for each ....I also have read in a book that the VA rating of Open-delta configuration is = 0.58 of ( Delta-Delta ) rating , how this relation been derived in the first place !?

and what's the different between each configuration and another , I know that only 2 transformers have to be used for Open-delta configuration , and 3 transformers for the rest configurations ....

what if the current ratings for each winding increased , could the open-delta configuration work as well as the Delta-Delta configuration !?

what about a transformer with capacity of 60 KVA what total 3-phase power can be obtained in each of the ; (Wye-wye) , ( Wye-Delta ) , (Delta-Delta ) , ( Delta-Wye ) , and Open Delta !?


thanks in advance .
 

Answers and Replies

  • #3
18
2
I've checked the links I found somethings interesting
I'm still wondering what might happen if I reversed winding polarities in both Wye and Delta connection , will there be a short circuit !?
 
  • #4
As long as you reverse the polarities in all three transformers, there should not be a short.
 

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