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

How can calculate thermal overload in relay?

1 Answers   ABB,

---

WHICH SUPPLY IS BETTER FOR 4 MW LOAD. 1)TO TAKE NEARER AVAILABLE 11 KV SUPPLY OR 2)TO TAKE 33 KV SUPPLY WHICH IS AVAILABLE AT 10 KM DISTANCE BY INVESTING NEARLY 50-60 LACKHS

1 Answers  

---

Why carbon brush used in dc motor also why its not used in ac motor?

2 Answers   RRB,

---

why neutral used in three phase motor connection?

3 Answers   BEL,

---

What are factors to be considered while we selecting the Core Balance Current Transformer for Earth fault protection

0 Answers  

---

---

resistance switching is used in case of- ? a. air blast CB b. bulk oil CB c. minimum oil CB d. all types of CB

4 Answers   HCL, SSC,

---

why the field winding in dc motor is not short circuited eventhough dc supply is applied across the winding

0 Answers   Torrent Pharma,

---

What will be the effect if I use inverter as UPS mood?

0 Answers  

---

what is RNG in the DG synchronizing by PLC?

0 Answers  

---

what are the disadvantages of leading P.F(power factor)?

2 Answers  

---

On what basis the the size of Lightning arrester for buildings are selected ?

0 Answers   KGD,

---

give me name of current and volatge control device

1 Answers  

---