Answer / rajesh

wat the bleddy answer ...if u dont know u shouldnt post tat
worst answers.....
nw see answer...
its nt 5 degrees dear tat 11 means it resembles 11 o clock
in a wall clock tat means it makes 30degrees.......
so tats it ther is phase between primary and secondary of
30degree
THIS IS A COMMERCIAL NOTATION OF TRANSFORMER

Answer / anil

the first letter must be capital one, which represents HV
winding while second letter should be lower case, which
represent LV winding of transformer.
1. 'D' - HV winding is delta connected & 'Y'- HV winding
is star connected
2. 'd' - LV winding is delta connected & 'y'- LV winding
is star connected
And rest of number indicating phase displacement angle
i.e 1 = 30°, 2 = 60°, 3 = 90°, 6 = 180° and 12 = 0° or
360°.

so
Dyn11 indicates,
Delta connected HV winding, star connected LV winding with
neutral brought out, LV is leading HV with 30°

Answer / meenakshi

i agree vid anil...to b more specific,Phase rotation is
always anti-clockwise. (international adopted convention)
we use the hour indicator as the indicating phase
displacement angle. Because there are 12 hours on a clock,
and a circle consists out of 360°, each hour represents
30°.
Thus 1 = 30°, 2 = 60°, 3 = 90°, 6 = 180° and 12 = 0° or
360°.
The minute hand is set on 12 o'clock and replaces the line
to neutral voltage (sometimes imaginary) of the HV winding.
This position is always the reference point.
Because rotation is anti-clockwise, 1 = 30° lagging (LV
lags HV with 30°)and 11 = 330° lagging or 30° leading (LV
leads HV with 30°)

Answer / virender s negi

I correct my self it is a 30 degree phase shift.

Thank's rajesh for your inputs.

Answer / virender s negi

DYn11 Means D=Delta, Y=Star, n=neutral, 11= 5degree phase
shift. This means there is a phase shift of 5 degree from
primary to secondary of a transformer.

When do you use a VFD motor?

3 Answers  

---

if the voltage across the lamp drops by 1%, the power drawn will be reduced by how many %?

5 Answers   PSPCL,

---

how can you calculate the value of external resistance inserted in a slipring industion motor? (eg. 110 kw / 990 rpm/50Hz/stator v-415/stator Amp-195/Rotor V-440/Rotor amps- 151.)

6 Answers   Bosch, NMDC,

---

How to calculate the average power factor in 3 phase unbalanced system

5 Answers   Bhel, MacLellan,

---

Why transformer is rated in kva?

4 Answers   L&T, NDPC,

---

---

Why in earthing, the earthing plate is put in vertical position? and further what is soft coke that is used in earthing?

3 Answers   Wipro,

---

What do you mean by distributed winding in alternators? how exactly is 3 phase power generated?

2 Answers  

---

I want to make street light with solar system ... What may I do for procedure and how much of estimation for each material ... If any one knows guide me and inform this id : aravindd7@gmail.com

0 Answers   Suzlon,

---

why we changed the polarity of DC generator ?

1 Answers   DMRC, Microsoft,

---

Which is stiffer between salient pole rotor and cylindrical rotor synchronous machines? Justify your answer.

1 Answers  

---

What is value of earth resistance required for substation and equipment earthing and what are the reference guidelines

0 Answers   Glenmark,

---

Is a induction motor rotate by back emf ? If not , then how it is rotate ?

1 Answers  

---