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WHAT IS THE SIGNIFICANCE OF VECTOR GROUPS IN TRANSFORMER?
WHAT WILL BE EFFECT WHEN PHASE DISPLACEMENT CHANGES IN
TRANSFORMER?

Answers were Sorted based on User's Feedback



WHAT IS THE SIGNIFICANCE OF VECTOR GROUPS IN TRANSFORMER? WHAT WILL BE EFFECT WHEN PHASE DISPLACEME..

Answer / jagadisha

The vector group is used to know the type of winding in
Transformer.First letter in the vector group indicates
primary winding(neutral is indicated if present) and the
second letter indicate secondary winding and next letter is
indicate phase difference between primary and secondary..
let us consider vector group Dyn11-It is most coomon 3-PH
connection,ie Delta is on primary and Star on sec with phase
displacement of 30deg

Is This Answer Correct ?    19 Yes 10 No

WHAT IS THE SIGNIFICANCE OF VECTOR GROUPS IN TRANSFORMER? WHAT WILL BE EFFECT WHEN PHASE DISPLACEME..

Answer / bijay

well things are explained well above.
i wud like to add something
WHAT WILL BE EFFECT WHEN PHASE DISPLACEMENT CHANGES IN
TRANSFORMER ?
Ans:-First thing under an abnormal condition(during fault)
the neutral point of trafo rised above the ground potential
and attains a positive potential,hence a current will flow
through the trafo neutral to the ground (mostly the trafo
neutral is earthed with or without a NGR.
As a whole the bottom line is trafo neutral will rise to a
potential which is not desired,protection against the same
is designed,which cut of the supply it this condition
prevails for a longer time( this time is descided at the
time of designing the system.

Is This Answer Correct ?    13 Yes 6 No

WHAT IS THE SIGNIFICANCE OF VECTOR GROUPS IN TRANSFORMER? WHAT WILL BE EFFECT WHEN PHASE DISPLACEME..

Answer / sunil ulange hit nidasoshi

Vector Groups are made especially to make out difference in
the connections. The connection can be delta(D) or star(Y)

The primary winding connection always denoted by Capital
Letter (D), and secondary winding connection always denoted
as small letter (y), and neutral n

The number after that indicates the phase difference
between the primary and the secondary voltage.

e.g.-> DYn11 means transformer is star connected with
secondary voltage leading the delta connected primary
voltage by 30 degrees.

normally distribution transformers are have Dyn11 connection
because secondary of transformer are connected to at user
end means motors,inductive load etc,

These loads always havelagging Power factor thatswhy Dyn11
connected transformer means secondary volatage leads by
primry voltage by 30 degrees, hence Power factor maintened
constant.

In Clock 11 indicates angle between 12 & 11 is 30 degrees
i.e. 360/12=30 degree

Sunil ulange
Application Engineer
Southern power equpment Limited bangalore

any Questions @ sunil_031@yahoo.com

Is This Answer Correct ?    16 Yes 11 No

WHAT IS THE SIGNIFICANCE OF VECTOR GROUPS IN TRANSFORMER? WHAT WILL BE EFFECT WHEN PHASE DISPLACEME..

Answer / poonam

Vector Groups are made especially to make out difference in
the connections. The connection can be delta(D) or star(Y)
The number after that indicates the phase difference
between the primary and the secondary voltage.
e.g.-> Y11 means transformer is star connected with
secondary voltage leading the primary voltage by 30 degrees.
I am not sure of the effect of phase displacement in
transformer

Is This Answer Correct ?    16 Yes 12 No

WHAT IS THE SIGNIFICANCE OF VECTOR GROUPS IN TRANSFORMER? WHAT WILL BE EFFECT WHEN PHASE DISPLACEME..

Answer / geno peter

well , significance of vector group depends upon the load
of the transformer. if phase displacement changes then the
connections in the transformer or tap switch of the
transformer has some problems

Is This Answer Correct ?    2 Yes 7 No

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