Answer / pramit dutta

according to condition of paralleling of two or more 3 phase transformer banks ,the phase shift between primary and secondary voltages must be same. it follows that all transformers in same main group can be connected in parallel.

Answer / raul

Yes, it is possible to parallel the YD11 AND DY1. Because
they lie in the same phase difference group family of the
paralleld connections. Since the phase angle difference
between the primary and secondary in both the cases is 30
degree lead and lag.

The possible parallel connections are :
1) YD1 AND DY11
2) YD11 AND DY1
3) DD0 AND DD6
4) YY1 AND YY11

Answer / 7anoter4

You can turn DY1 into DY11 by swapping phase B with W.See:

http://files.engineering.com/getfile.aspx?folder=df1b9784-
7409-4333-a537-
780523d888a8&file=How_to_turn_a_Dy11_transformer_into_a_Dy1.
pdf

Answer / 7anoter4

It is not possible since there are not the same phase angle
shift [they have to be in the same group of connections]
See:

http://electrical-engineering-portal.com/principles-of-
transformers-in-parallel-connection-1

Can you tell me more about pu systems (per unit systems )calculation in large power systems? how to get the base for voltage and power in generator, transformator and transmission lines?

0 Answers  

---

DGs fuel and lube oil filters are not equal to one another.Why it is so.For example one MTU enginee fuel filter is one and lube oil filter-02nos other DGs are more.Please explain

1 Answers  

---

What is the difference between a Distribution Transformer and a Power Transformer.

4 Answers  

---

How can I communicate with an Areva MiCOM P121 relay by RS485 port? In other word, which command can I send and what information can I have recieved? please send some refrences, please. thanks

3 Answers  

---

BRIEF ME CHECKING PRCEDURE OF BATTERY 12V 26AH

1 Answers   DRJ ARDE,

---

What do u mean by Line voltage Monitor?Where it is used in a Power system?

2 Answers  

---

what is the difference between indoor package substation and outdoor

3 Answers  

---

How Load Factor, Demand Factor, Diversity Factor etc best applied in designing an electrical circuit? Is it allowed to consider these factors in each and every panel in an electrical distribution system? Can any body suggest a good book for reference?

0 Answers   Oberoi,

---

I have 150/1A Rating CT Suppose if i inject 15A in CT " Secondary" means what will happen ??????

1 Answers  

---

what is draiv work

0 Answers  

---

what is boucholz relay and the significance of it in to the transformer?

2 Answers  

---

if generator is running in iso mode parrallel with grid and suddenly grid breaker off what will happen?

6 Answers   century,

---