ALLInterview.com :: Home Page            
 Advertise your Business Here     
Browse  |   Placement Papers  |   Company  |   Code Snippets  |   Certifications  |   Visa Questions
Post Question  |   Post Answer  |   My Panel  |   Search  |   Articles  |   Topics  |   ERRORS new
   Refer this Site  Refer This Site to Your Friends  Site Map  Bookmark this Site  Set it as your HomePage  Contact Us     Login  |  Sign Up                      
Google
   
 
Categories >> Engineering >> Electrical Engineering
 
 


 

 
 Civil Engineering interview questions  Civil Engineering Interview Questions (3076)
 Mechanical Engineering interview questions  Mechanical Engineering Interview Questions (3288)
 Electrical Engineering interview questions  Electrical Engineering Interview Questions (13328)
 Electronics Communications interview questions  Electronics Communications Interview Questions (2363)
 Chemical Engineering interview questions  Chemical Engineering Interview Questions (416)
 Aeronautical Engineering interview questions  Aeronautical Engineering Interview Questions (77)
 Bio Engineering interview questions  Bio Engineering Interview Questions (17)
 Metallurgy interview questions  Metallurgy Interview Questions (79)
 Industrial Engineering interview questions  Industrial Engineering Interview Questions (163)
 Instrumentation interview questions  Instrumentation Interview Questions (2378)
 Automobile Engineering interview questions  Automobile Engineering Interview Questions (106)
 Mechatronics Engineering interview questions  Mechatronics Engineering Interview Questions (38)
 Marine Engineering interview questions  Marine Engineering Interview Questions (43)
 Power Plant Engineering interview questions  Power Plant Engineering Interview Questions (75)
 Engineering AllOther interview questions  Engineering AllOther Interview Questions (1196)
Question
What is the meaning of Dyn11 of Transformer.
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
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
 
Is This Answer Correct ?    72 Yes 3 No
Devidas
 
Answer
# 2
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.
 
Is This Answer Correct ?    94 Yes 32 No
Abhinav Yadava
 
 
 
Answer
# 3
D- delta,Y-star,N-neutral,11-11'O clock position of Phase
angle
 
Is This Answer Correct ?    55 Yes 7 No
Anand
 
Answer
# 4
Dyn11 ,means lv winding leads the HV winding by 30degree
electrical phase shift.Moreover the secondary is the 3
phase 4 wire system.
 
Is This Answer Correct ?    54 Yes 10 No
Gowhar R Reshi
 
Answer
# 5
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.
 
Is This Answer Correct ?    45 Yes 7 No
M Nazri
 
Answer
# 6
Dyn11 means the Secondary side winding (Star)lags the
primary side winding (Delta) by 330 Electrical Degrees.
 
Is This Answer Correct ?    25 Yes 7 No
Narendran
 
Answer
# 7
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.
 
Is This Answer Correct ?    11 Yes 0 No
Parth
 
Answer
# 8
delta to star neutral postition is 11'o clock 
Is This Answer Correct ?    21 Yes 11 No
Natarajan
 
Answer
# 9
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.
 
Is This Answer Correct ?    13 Yes 3 No
Sumit Dhar
 
Answer
# 10
Dyn11---> DELTA connected HV, STAR connected LV with NEUTRAL out and LV leads HV by 30 degrees. 
Is This Answer Correct ?    3 Yes 0 No
Jay
 

 
 
 
Other Electrical Engineering Interview Questions
 
  Question Asked @ Answers
 
what is the contact resistance of sf6 circuit breaker??   1
what are the effects on an power plant and consumers if the power factor is increased or decreased?   2
only three phases are coming in step down tranformers.how to get neutral?   5
after parallaing two generators current is shooting up in both the generators.for ex: load is 400 kw..after paralling and load sharing current in running gen is approx 900 amps and incoming is 750 amps which is too high when trying toshift the load current in incoming gen is coming more than 1300 amps and both getting tripped and making blackout..   3
how could we findout the lightning arrester failed or not in live circuit? Is there any instrument to measure the high voltage at the time of sky lighting?   1
I hv a question regarding power factor improvement just after transformer. I request you to reply me plzz. thank you sir. My friend has a small unit of fabrication. in his factory the main load is a welding machine, lathe machine, grinding machine. this load is not continuous type. now our electricity board has installed 16 KVA, 11000/433 V transformer for our factory. In the energy meter (trivector meter) at LV side of transformer, i hv seen power factor value of 0.15 only when only 3 KW load was flowing. Further electricity board has suggested to install 4 KVAR capacitor at LV side after energy meter. Now my question is that if we permanantly install and switch on 4 KVAR capacitor after energy meter, during some load on transformer and also without any load on transformer, wht will be the power factor shown in energy meter?i dont want to get any penalty by electricity board, so plz suggest me if i can permanantly install and switch on the 4 kvar capacitor or not at LV side of transformer just after energy meter? Thank you again and awaiting for ur positive reply soon.   8
Why we have use 3 & 1/2 core cable use for general electrical supply arrangement   1
how to check the stabilty test for generator differential protection   1
what is rotary ups?   2
Wtat is vaccum currcuit breaker.define with cause of used.and where be use it Devise .   1
What power factor maintain you maintain at u r organisation Wheels-India 14
findout of current?details 440v,3phase,085pf,hp-5   9
 
For more Electrical Engineering Interview Questions Click Here 
 
 
 
 
 


   
Copyright Policy  |  Terms of Service  |  Articles  |  Site Map  |  RSS Site Map  |  Contact Us
   
Copyright 2013  ALLInterview.com.  All Rights Reserved.

ALLInterview.com   ::  KalAajKal.com