why we use 3 phase in our country?..why no 4,5 or 2??

Question Posted / manisheee

2 Answers
9682 Views
Siemens, I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

why we use 3 phase in our country?..why no 4,5 or 2??..

In 3 phase supply phases are120 degree electrical aparts each and for a technician it is easy to use such connect the machine with sequence or obtain uniform rotating magnetic field in motor, so India follow this.

Is This Answer Correct ?

17 Yes

5 No

why we use 3 phase in our country?..why no 4,5 or 2??..

Answer / raheel4u

3 Phase has 3 wires carrying power (a 4th wire has ground). The voltages on the 3 wires with respect to ground each look like a normal sine wave at 110V but the peaks of the sine waves are delayed evenly so that wire 1 peaks, then wire 2, then wire 3, then back to wire 1 in equally timed spacing. This is called 120 degree phase between any 2 wires. This is the power coming out of power plants. 3 Phase is easy to use or create with generators and motors. 3 Phase was chosen because it needs less copper to carry power long distances. Modern technologies (transistors) can be very efficient with converting DC voltages now but when the power grid system was created we mostly only had transformers and wires.

Is This Answer Correct ?

9 Yes

18 No

Post New Answer

More Electrical Engineering Interview Questions

What are armoured cables?

2 Answers IOCL,

how to calculate cable size in transformer, distribution side?

1 Answers

If I want to buy a new Xformer for my plant what are the main parameter will I need to check?

0 Answers

Do we really need wheels for the transformer

1 Answers

What are the essential characteristics of signal flow graphs?

0 Answers

which plant has high load factor

10 Answers APTransco,

how to calculate transformer turn primary & secondary side 11kv to 420v

0 Answers

which fault is severe and why?between lll fault and lllg fault which fault is severe and y?

0 Answers GE,

reason of capacitor failure or low voltage in alternator wtih 10kva dgset

0 Answers adag,

can the measured percentage error during calibration of single phase energy meter be negative?

0 Answers

if you asked to choose a ckt breaker from MCB & MCCB for 32A which one will be best and why??

7 Answers

I have doubt that the supply HZ (very low or high than rated ) may affect the power factor. is it true. ?

0 Answers

For more Electrical Engineering Interview Questions Click Here