Answer Posted / e.saravanan

Assumed the transformer vector group is DYn11;
1.1U1V1W-which is primary -Delta Connection
2.2U2V2W2N- Which is secondary-Star connection
3.By connecting terminals 1U& 2U
4.Then three phase Supply is given to 1U-1V-1W
5.By measuring the terminal given below
We get
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
THE BELOW GIVEN CONDITION IS SATISFIED THEN DYn11 IS
CONFIRMED
1.1V-2W=1V-2V
2.1W-2V>1W-2W
3.1U-1V=1V-2N+1U-2N

how can we make cable shedule for controll wiring ? which details must be required for it.?

2118

---

how to define tell me about self

1987

---

HELLO EVERYONE, I RECENTLY HAVE FOUND ONE PROBLEM, I WAS TAKING NO LOAD TRIAL OF AN HT MOTOR 920 MOTOR , 1440 RPM , 6.6 KV, WITH AUTO TRANSFORMER. AT 450 V, LOAD WAS 40 AMP AND SPEED WAS 250 RPM. BUT AS WE INCREASE VOLTAGE FROM 450 TO 480V, LOAD BECOME 41 AND SPEED REDUCED TO SOME RPM . SO WHICH PHENOMENON ACTED HERE FOR REDUCING SPEED.?? AND IS IT HAPPENING ALWAYS OR IT IS RARE? I ALSO HAVE FACED SUCH PROBLEM WITH FEW LT MOTOR ALSO.

1940

---

How to calculate VA rating for CT or PT or Control Transformer?

2835

---

What size cable (based on voltage drop) is required to supply a 40 A three phase boiler if the wiring system is 75V single insulated cables installed in non-metallic rigid conduit 56m from the main switchboard? Voltage drop in the consumer's mains is 8V.

1962

---

How to select the proper VSD to operate high inertial load

1717

---

What is resolution of a measurement?

1181

---

in cvt,there are two windings,1a,1n and 2a,2n.in my one project i use only one winding i.e.1a,1n. the other winding is not in use, so i connect it in open delta and want to close it by ibsertibg thermal resistor. the output of cvt is 132kv/115/sqrt3. plesae tell me exact value of resistor, so i may close it to avoid the resonance phenomenin. send me answer on this email adress please. aetcon-po@aetcon.com

2833

---

Is there any reason that we get shock on touching phase wire because the earth is at neutral potential? Is there any reason that the earth is at neutral potential because the neutral is earthed in apower station

1998

---

i want use the cable size 16cx4 core aluminium usege watts 240x2000w this cable size is correct?

2183

---

How to select a cable size for particular load?

1804

---

WITCH CARDS IN USE IN FIRE CONTROL PANEL.

1900

---

what are the necessary basic electrical topics to learn for mechanical engineer to deal practical problems.

2213

---

can any one know is sbi interview based on merit or based on roll number

1969

---

hi this is hema, r there any books in particular for the preparation of the APPSC-A.E.E(electrical), if so please mail me the names ... thank u .

1906

---