what happen if i connect DYn11 and DYn1 vector group
transformer in parrallel?other things are same like votage
ration,x/r ratiob etc...
Answers were Sorted based on User's Feedback
Answer / salah
Dyn11-secondary voltage lags primary by 30degree
Dyn1-secondary voltage leads primary by 30deg
hence it is not satisfying the condition for
pare;;alisation .
if we connect two TR in parallel current drwn form the
source by both transformer is not in phase hence
circulating current will produce & damage the winding as
well in secondary aslo
Is This Answer Correct ? | 38 Yes | 13 No |
Answer / tanesh
When DYn11 and DYn1 are out of phase by 60deg. Although the magnitude of both transformers are same, but phase different would cause potential difference between the transformers. This will cause short circuit the two transformers are paralleled.
Is This Answer Correct ? | 4 Yes | 3 No |
Doug - you are absolutely right for Dyn1. To look at this graphically, a positive 30 degree angle of secondary to primary means that secondary voltage sinusoidal wave starts 30 degrees after the primary sinusoidal wave. Hence in reality it is indeed lagging the primary. Just reverse for Dyn11.
Is This Answer Correct ? | 0 Yes | 0 No |
Answer / doug marshall
As I understand it, the convention is counterclockwise
rotation. Therefore DYn1 means that the secondary lags the
primary by 30 degrees (Subtractive Polarity). DYn11 means
that the secondary lags the primary by 330 degrees which is
the same as secondary leads the primary by 30 degrees
(Additive Polarity). Likewise, a DYn1 when operated as a
YnD1 (Step Up), the secondary or delta leads the primary Y
by 30 degrees. Therefore two DYn1 transformers connected in
series DYn1 - DYn1, the output will lag the input by 60
degrees but YnD1 - DYn1, the first stage results in the
intermediate voltage (Delta) leads by 30 degrees and at the
last stage, there is a 30 degrees lagging phase shift so
the sum phase shift from Y - Y is 0 degrees.
Is This Answer Correct ? | 7 Yes | 17 No |
How to synchronization will be done between two DGs ?
DOES AN EARTH FAULT CURRENT ON THE DELTA SIDE OF A 6.6/33KV STEP UP STAR-DELTA CONNECTED TRANSFORMER REFLECT ON THE STAR SIDE? IF YES, THEN HOW AND WHAT IS THE AMOUNT OF CURRENT REFLECTED?
why we do not switched on capicitor panel with DG Supply
Earth bits close or open. Which is correct
What is the difference between bundled conductors and double circuit?
what is meant by HT<?
how can u do the earthing of an aeroplane?
state the working of discharge lamp?
Can we connect more than one NGR at a time of different rating of generators. what is advantage or disadvantage.
If the 11 KV supply is fail. what will happened with it's breaker if it is supplay to the 11KV motor?
why battery is connected in parallel ?
Which Motor used in Fan's Motor ?
3 Answers Matsui Technologies,