What is difference between Dy11 & Dyn11 vector group
transformer. Can both these transformers operate in
parrallel.
Answers were Sorted based on User's Feedback
Answer / ravi
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:
Dd0
Delta connected HV winding, delta connected LV winding, no
phase shift between HV and LV.
Dyn11
Delta connected HV winding, star connected LV winding with
neutral brought out, LV is leading HV with 30°
YNd5
Star connected HV winding with neutral brought out, delta
connected LV winding, LV lags HV with 150°
" So there is no specification of Dy11.. it will be Dyn11 "
Is This Answer Correct ? | 62 Yes | 18 No |
Answer / pb
Dyn11 means Primary---Delta, Secondary---Star with neutral
brought out and secondary leading the primary by 30 deg
In case of Dy11 --- neutral is not brought out, rest
remaining the same as above.
Is This Answer Correct ? | 28 Yes | 6 No |
Answer / sunny
thanks ravi
i had searched all over the net but didn't cleared myself.....
very easy & understanding
Is This Answer Correct ? | 13 Yes | 7 No |
Answer / jim kirk
Mr Ravi
An excellent explanation - but there are DY11 transformers - we have two of them onsite
Is This Answer Correct ? | 0 Yes | 0 No |
Answer / kandavel .p
Thanks Mr Ravi i understood clearly ,your way of explanation is good thanks lot
Is This Answer Correct ? | 2 Yes | 3 No |
how the grounding[earting] is achieved on ships.
What will be the direction of rotation of a Alternator in case it goes in motoring action when connected with grid ?
In Delta connected capcitor bank, One bank failed due to some problem. Can we connect Open delta capacitor bank to 3 phase motor. The motor voltage rating is 6.6KV. IF yes what changes will happen?
In Single Phase AC Supply,If Voltage between Phase and Neutral is 230V means what will be the Voltage between Phase and Earth?
How the power factor is more in high speed machines
what is tandem isolator ??????????
how many desk top computer can connect to a 25kva 3phase generator?
Just a silly question but just to make my curious mind bac to normal - Why was not 67 and 67N relays built into a single relay as i have noticed that the R,Y,B CT wiring end up into the 67 relay while the common of the R,Y,B CT wiring end up into the 67N relay. Then it was better if a single relay was manufactured just like the distance relay (21). Another question i would like to ask is - how do we know where the 67 and 67 N relay has to be placed.why is it not placed at the transformer bay? In the substaion that i am working -i have noticed that it is placed between a breaker and a common double bus bar and this line bay is connected to another substation at a remote place which is furthur connected to a load. B U S______CT for 67 & 67N ______Breaker _____ remot s/s. B A R
function of apfc pannel
What is the Maximum Power generation capacity of a Synchronus Machine ??
What is the effect of leading power factor for power transformer & D.G?
In which working principal temperature transmitter work.explain in detailed.