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

choose the non-switch device (A) transformer (B) diode (C) transistor (D) IC

3 Answers  

---

what about electrical pannel.? What is meant by plc pannel.?

0 Answers   TATA,

---

How to calculate Number of Earthing Pits....???

0 Answers  

---

in an industrical wiring, why we are using lighting DB and Power DB separately?

3 Answers  

---

Is this possible to synchronize the two different ratings of dg

1 Answers  

---

Whats changes in Transformer Oil BDV in changes in temp or Climate?

2 Answers   TATA,

---

what is meant by armature reaction & where its happen ?

3 Answers  

---

why star point of HT motor not earthed?

0 Answers  

---

Short circuit current of 2500 KVA 11/0.415 KV transformer both Secondary and primary side. best regards. Ali

1 Answers  

---

PLZ EXPLIN ABOUT CLASS PS CLASS CT .WHY THEY R DESINED AND FOR WHAT PURPOSE?WHY OTHER CT CANT BE USED AS PS CLASS CT? EXPLAIN IN SIMPLE LAUNGAGE IF POSSIBLE PLZ GIVE CIRCIT DIAGRAM?EMAIL-RAJ_SINGH_0376@SIFY.COM

0 Answers   ABB,

---

explain Uninterrupted power supply detailed electronical operation with circuit diagram

1 Answers   Emerson,

---

what is electronic regulator and how we can use that in fans?

3 Answers  

---