Answer / ambrish

Pl. show the standard formula to check vector group tst for
any type of transformer.

Answer / raj

the above answer is correct but suppose a newly transformer
has come on the site ?
and nothing is written on the transformer how v will do the
vwctor test for that any one will explain that

Answer / tansford

Superimpose the HV & LV vectors with 1U & 2U as common it
clearly shows the relation between the phasors
Every vector group will have a different relation &
equation to be evaluated

Answer / raj_singh_0376

Procedure of vector group test of transformer


Let’s have a YNd11 transformer.

1) Connect neutral point of star connected winding with earth.

2) Join 1U of HV and 2W of LV together.

3) Apply 415V, three phase supply to HV terminals.

4) Measure voltages between terminals 2U – 1N, 2V – 1N, 2W – 1N, that means voltages between each LV terminal and HV neutral.

5) Also measure voltages between terminals 2V – 1V, 2W – 1W and 2V – 1W.

For YNd11 transformer, we will find,
2U – 1N > 2V – 1N > 2W – 1N
2V – 1W > 2V – 1V or 2W – 1W

Answer / ponnudura

can anyone say me hoe to draw vector group and what is the
use of different vector group and its application plz

Is This Answer Correct ? 17 Yes 8 No submit
srinivas

Answer
# 8 1.1U1V1W-which is primary -Delta Connection
2.2U2V2W- Which is secondary-Star connection
3.join 1U& 2U terminals
4.Supply 1U-1V-1W 440v Measured
a.1U-1V
b.1V-1w
c.1W-1U
d.1W-2W
e.1V-2W
f.1V-2V
g.1W-2V
h.1U-2N
i.1V-2N
TO CHECK
1.1V-2W=1V-2V
2.1W-2V>1W-2W
3.1U-1V=1V-2N+1U-2N
From above check(1,2) the vector group of transformer is
verified

Answer / balaji

1) Can i know why we are making short of any phase during vector group test ?
for Example R-r,Y-y Like that
2) while doing the vector group why the neutral earth should be removed ?

at meter room 50 hrc switch installed,but there are not get earthing proper,so what happen?and 11kv transformer out put going in to hrc main 400a three nog each? so earthing is require for all switch? (some customer made earthing at there home.)

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