Answer / j

To determine phase displacement

Answer / pratik

It is to be carried out to check whether the transformer
under test is suitable for parallel operation with another
transfomer having same vector group and voltage ratio but
difference in KVA rating.

Answer / sachin

Vector group analysis done in transformer test, so that we
can check the phase displacment and polarity of the
transformer.

Answer / eka

parralling operation of trasformer

Answer / fred jabagat

Vector Group can be used as basis in setting the phase
compensator factor for numerical transformer differential
relays, i.e. SEL387.
A 3-Ph Transformer is wired internally in different ways to
produce a desired phase position between primary and
secondary terminals.
IEC standards develop a transformer circuit configuration
and a corresponding vector group code which follows a clock
that represents a 30 degrees shift in every hour.
The CT's of a numerical transformer differential relays are
usually wired with its polarity mark facing away from the
protected winding. Because of the phase shift between the
primary and secondary terminals of the transformer it is
necessary to set a phase compensator factor to the
differential relay so that it will not trip on normal load.

Answer / saju thomas

Mostly using transformer phasing arrangements are
DYn11,DYn7,DYn5.This is related to phase
displacements.vector group test is doin for analaysing
transformer phaseangles as per the phasing arrangements
like DYn11 or DYn7 or ...

Answer / shrinivas

vector group are made to know at what position the secondary
winding of transformer we get star and delta voltages . and
it indicates the type of winding in primary and secondary
which helps in parallel operation of transformer with
different ratings having same vector group .

Answer / joe callaghan

Transformer vector relationship is tested by shorting the
primary A phase to secondary A phase, then applyying a
three phase voltage to the primary side of the transformer.
Voltage measurements are then taken as follows:

A-B
B-C
C-A
B-b
C-b
B-c
C-c

These values will then allow you to draw the vector diagram
of the transformer.

Answer / dinesh kumar

1,Vector group is done on transformer High voltage winding
with respect low voltage winding.
2,To find the phase angle/difference between different
connections in high voltage windings.
3,In three phase winding transformer there are 36 vector
groups.(1u1v1w 2u2v2w)

Answer / dhaval

to determine the primary and secondary winding of the
tranformer that how the winding is connected

we can conformed the vector group of the transformer. How?

0 Answers  

I NEED THE CABLE SIZE. I=800A AND P=315KW

2 Answers   ABC, Wipro,

How many battery required for an 3kva online ups with 3 hrs back up with usage of 3 fans,3tube lights

1 Answers  

A system having the charactristic eqation (s+1)(s+2)(s-3)=0 is (a)stable (b)unstable (c)marginally stable (d)critically stale

1 Answers  

How Calculat the Cable Sizing of HT/LT System & Explian by one Exampal?

1 Answers   Siemens,

How to select the earthing transformer,for DELTA TO DELTA TRANSFORMER OR ALTERNATOR SIDE.Pls post your answers and calculation.

0 Answers  

in an ac series circuit there are 30 bulbs are connected in a serial set.what will happen if one bulb is fused and we removed the bulb and reconnect with the remaining bulbs? (29 bulbs). will the brightness of other bulbs increase or not?

3 Answers  

How does an induction motor start?

0 Answers   Ericsson,

a 100mva,400/200v transformer has leakage impdce of 10% draws a steady state line currentof---------------

0 Answers  

Why and when NGR panel required. Is it necessary to design a NGR panel for a 6.6kV Alternator paralleling with Grid????

0 Answers  

WHAT AC (HI VOLTAGE TEST) VOLTAGE SHOULD APPLY FOR 33KV CABLES.EXPLAIN IN DETAIL

12 Answers   NTPC, Voltech,

Why negative feedback is preferred in the control system?

0 Answers