Answer / devidas

First symbol/symbols, capital letters: HV winding connection.
Second symbol/symbols, small letters: LV winding connection.
Third symbol, number: Phase displacement expressed as the
clock hour number.

Winding connection designations

High Voltage Always capital letters
Delta - D
Star - S
Interconnected star - Z
Neutral brought out - N

Low voltage Always small letters
Delta - d
Star - s
Interconnected star - z
Neutral brought out - n

Phase displacement
Phase rotation is always anti-clockwise. (international
adopted convention)
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°)

To summarise:
Dyn11
Delta connected HV winding, star connected LV winding with
neutral brought out, LV is leading HV with 30°

Answer / anand

D- delta,Y-star,N-neutral,11-11'O clock position of Phase
angle

Answer / abhinav yadava

Dyn11 is vector group notation of tansformer.It means LV
winding,which is star connected (written in small letters
means LV side and vice versa)is 30 degrees lagging by HV
winding which is delta connected.In India we go for +-30
deg connection of transformer.

Answer / m nazri

D = Delta connection at primary,y = Star connection at
secondary and n = neutral point connected at secondary.
Dyn 11 means that the voltage of the secondary star winding
lead the primary phase voltage by 30 degree and it
corresponds to 11 o'clock.

Answer / gowhar r reshi

Dyn11 ,means lv winding leads the HV winding by 30degree
electrical phase shift.Moreover the secondary is the 3
phase 4 wire system.

Answer / narendran

Dyn11 means the Secondary side winding (Star)lags the
primary side winding (Delta) by 330 Electrical Degrees.

Answer / parth

First symbol/symbols, capital letters: HV winding
connection.
Second symbol/symbols, small letters: LV winding
connection.
Third symbol, number: Phase displacement expressed as the
clock hour number.

Answer / sumit dhar

Dyn11:
D- Delta Connection in HV side. Notice the "D" is written in
Capital letter which means HV connection.

y- Star Connection in LV side. Notice the "y" is written in
small letters which means LV side

n- This represents that the Star side of the transformer is
connected to the ground with the neutral wire. If n is not
there, it means the star side of the transformer is unprotected.

11- represents 11'o clock which is 30 degree angle

other representations are

0- phase displacement is 0 degrees
6- represents 6'o clock position which is 180 degrees.

Answer / natarajan

delta to star neutral postition is 11'o clock

Answer / jay

Dyn11---> DELTA connected HV, STAR connected LV with NEUTRAL out and LV leads HV by 30 degrees.

In D O l starter motor starts as a star connected ,then in star delta starter also motor initially starts as star how come star delta is preferred from dol

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