Answer / avnish

above answers are correct but as u asked shraddha that will
hv lead or lv so i clear that capital D is for secondary and
small forthe primary and again 11 ....means that hv have the
30 degree leading phase diffrence..

Answer / ghost rider

Abobe two reply explained correctly "what is vector group".
The answer to the last question "why it is needed" is as
follows:-
By virtue of constrction & terminal connections of the
transformer, a difference between primary vector &
secondery vector occurs. We need to know the same for the
following reasons:-

1)Matching of vector group is required (to avoid
circulating current/ fault ), when 2 transformer need to be
operate parallal on a common bus/system.

2) to provide transformer differential protection correctly.

etc

Answer / strateia

The Dyn11 is interpreted as follows:
D-primary winding is delta connected (i.e the three primary
phase windings within the transformer)
y-the secondary winding is delta connected

11-is a multiplying factor for the phase displacement
between the primary and secondary voltages
i.e. for the Dyn11, phase displacement is
= 11*30degrees
= 330 degrees

WHY IS HV WINDING OF A TRANSFRMER SECTIONALIZED???

3 Answers  

---

What is a soft start?

4 Answers  

---

how and where does star and delta connection is used ?

2 Answers  

---

I am an American living in Vietnam and I have recently gotten a refrigerator from Japan and it is rated for 100 vac, but the power here is 220 so I bought a voltage stabilizer it has a 1 kva output rating. Can you please tell me what the amperage is? I'm confused and without a working fridge.

0 Answers   BSL,

---

What type of fittings and electrical accessories can be install in radiation area ?

0 Answers  

---

Why winding temperature ct placed in B-Phase of the transformers?? 

3 Answers  

---

What is phenomenon of electromagnetic induction and how it works?

0 Answers  

---

what is The difference between national electrical code and I.S.Code (electrical) and what is the value of NEC in electrical engineering field

0 Answers  

---

what is hormonics. how it is generated & what are the problem faced by that.

5 Answers   APC,

---

What is the power plant or power station?

1 Answers  

---

How voltage step down is done?

3 Answers   IOCL,

---

why chock were used in old tubelights but are not newest tubelights?

0 Answers  

---