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 ?

WHY WE USE 4-20mA

5 Answers   Coca Cola,

What are the causes of electrical faults?

1 Answers  

how can check the resistance of battery contact?

0 Answers   Cipla,

1.why motor rating in kw instead of KVA? 2.why alternators rating in KVA instead of KW?. 3.why transformer rating in KVA instead of KW?.

6 Answers  

why overload relay is not tripped at time of starting of motor allthough staring current is too high?

5 Answers   TATA,

What does Bode plot tell you?

0 Answers   Ericsson,

which calss ct's,pt', use protection,meatering and others

1 Answers  

IF ANY MATERIAL AVAILABLE IN MARKET FOR MOTOR PROTECTION INSTEAD OF OLR & CONTACTOR ?

1 Answers  

As per standard, transformer body earthing and other Equipment earthing (Equipment earthing) did not connect. but in LT side termination we are doing metal glanding in both side Transformer to PCC Panel through armoured cable, now X'mer body earthing and PCC Pane earthing (Equipment earthing) both are connect.is this safe for X'mer or other equipment?

0 Answers  

No load test of induction motor is carried out to compute= A stator resistance B rotor resistance C magnetizing reactance D rotor reactance

1 Answers  

what is mean by dry frequency

0 Answers   Siemens, TCS,

why are laminations used in constructing the field core?

3 Answers