sigal phase supply is 230 v ac two phase supply is 415 v ac why three phase

sigal phase supply is 230 v ac
two phase supply is 415 v ac
why three phase supply is 415 v ac why not 690 v ac

Question Posted / srv.26@rediffmail.com

4 Answers
8913 Views
I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

sigal phase supply is 230 v ac two phase supply is 415 v ac why three phase supply is 415 v ac w..

Answer / prmeghwanshi

Because you measure voltage between onlt two point like RYB
when you connect N to any other RYB then voltage is 240V
(App.) this is called single phase.
when you connect one point into RYB(R) and other is also RYB
(other than R) is 440V this two phash. when you use three
phase voltage is measure in only two point like R to B R to
Y so it is also 440V. you can't measure voltage betwween
three point.

Is This Answer Correct ?

15 Yes

4 No

sigal phase supply is 230 v ac two phase supply is 415 v ac why three phase supply is 415 v ac w..

Answer / vasi

If Phase-Neutral voltage is 230v then Phase-Phase voltage in
3ph system willbe sq.root of 3 X 230v
The 3 ph are displaced 0-120-240 degrees and the Pitagor
Theorem can be used to count up the Line voltage
Another way to count up the Line(Phase-Phase) voltage is to
use vector analysis
1st Phase 0 degree 230+j0
2nd Phase 120 degrees cos120*(230) + sin120*(230) this gives
-115+j199
3rd Phase 240 degrees cos240*(230) + sin240*(230) this gives
-115-j199
in the end ph1-ph2 398v, ph1-ph3 398v, ph2-ph3 398v

Is This Answer Correct ?

10 Yes

1 No

sigal phase supply is 230 v ac two phase supply is 415 v ac why three phase supply is 415 v ac w..

Answer / arvind

its a very good question, see what we r measuring is phase
to phase voltage, in case of 3phase system,that means
beetween two phase is simple because we have two points of
voltmeter to measure the voltage.

Is This Answer Correct ?

1 Yes

5 No

sigal phase supply is 230 v ac two phase supply is 415 v ac why three phase supply is 415 v ac w..

Answer / san

its good question

You must start the engineering from first stage...

Very good

Is This Answer Correct ?

1 Yes

17 No

Post New Answer

More Electrical Engineering Interview Questions

can any one tell me about the Extra low voltage systems?From where we give supply to these type of systems??

0 Answers MCB,

difference between shunt coil and tripping coil

8 Answers GE,

The coulomb is a unit of:(a) Energy(b) Voltage(c) Power(d) Quantity of electricity

1 Answers

how we sesign the transformer give some specifion regarding design of transformers

0 Answers

Why the transformers are rating in KVA.?

5 Answers ISMT,

How many types of timer ?which timer are used star delta feeder

1 Answers BMM Ispat,

Why an ac systems are preferred over dc systems?

0 Answers

why transformers are put with supply for 24 hours before giving supplying to a locality?

2 Answers

In case you don't have coal and salt for earthing, how can you achieve good temporary earthing?

1 Answers Focus Energy, NHPC, ONGC,

what will happen if the field and armature both are made to rotate in a synchronous machine ?

4 Answers

Sir,I have finished my B.E in the Stream of EEE.How Can I get C license for Electrical???Please Tell me the way...My mail ID is praba1003105@gmail.com Cell:7402474123

1 Answers

Why we use CT on differant phases of 2ph.PT detection for brush-less static excitation of 3ph.,400v Synchronous Generator? What happen if use CT on same one of VT phase?

2 Answers Hydropower,

For more Electrical Engineering Interview Questions Click Here