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Question
```If single phase voltage level is 230V than why three phase
voltage level is not 660V ?, but it is only 440V.```
Question Submitted By :: Shah_saurin2002
I also faced this Question!!     Rank Answer Posted By

Re: If single phase voltage level is 230V than why three phase voltage level is not 660V ?, but it is only 440V.
# 1
Single Phase voltage = Phase voltage / sqroot of 3
 Is This Answer Correct ? 148 Yes 32 No
Max

Re: If single phase voltage level is 230V than why three phase voltage level is not 660V ?, but it is only 440V.
# 2
because the voltage is measured between the two terminals
only in 3 phase we are measuring it between 2 lines that is
why it is 440 and not 660

 Is This Answer Correct ? 84 Yes 34 No
Sunny

Re: If single phase voltage level is 230V than why three phase voltage level is not 660V ?, but it is only 440V.
# 3
In single phase

single phase voltage =phase voltage , but in three phase
line voltage =sq. root of phase voltage (i.e V
line=1.732x240 =415 vol.)

 Is This Answer Correct ? 91 Yes 13 No
Ashok Kumar

Re: If single phase voltage level is 230V than why three phase voltage level is not 660V ?, but it is only 440V.
# 4
our measering meater is have only two terminal that y 400v
 Is This Answer Correct ? 12 Yes 41 No
Kumar

Re: If single phase voltage level is 230V than why three phase voltage level is not 660V ?, but it is only 440V.
# 5
3 phase doesnot means 230+230+230

in three phase three lines carry same voltage but displaced
in time by 120* that is we obtain V (L-L)=400kv

 Is This Answer Correct ? 19 Yes 30 No
Percy
[Nit Raipur]

Re: If single phase voltage level is 230V than why three phase voltage level is not 660V ?, but it is only 440V.
# 6
Voltage is nothing but potential difference, so we can take
only 2 objects if we want to measure the difference between
them. So we always measure this difference of potential
between 2 not 3.

 Is This Answer Correct ? 17 Yes 16 No
Bbhanj

Re: If single phase voltage level is 230V than why three phase voltage level is not 660V ?, but it is only 440V.
# 7
because
single phase =phase voltage /square root of three
and the other reason is that the two terminals

 Is This Answer Correct ? 8 Yes 23 No
Hemantpandey

Re: If single phase voltage level is 230V than why three phase voltage level is not 660V ?, but it is only 440V.
# 8
because of the power generated from the 3 phase transformer
connected in Y

 Is This Answer Correct ? 4 Yes 21 No
Dragon Heart

Re: If single phase voltage level is 230V than why three phase voltage level is not 660V ?, but it is only 440V.
# 9
In single phase case; 220 v is potential difference between phase and neutral, whereas in three phase case potential difference between any two phase terminals will be around 415 v. All three lines show a potential difference of aprox 220 v with respect to neutral but are but are apart from each other by an angle of 120 degree (phase difference) so will exhibit almost double potential difference between any two line terminals. So for all practical purposes potential difference between any two phase terminals will be around 415v. However for power calculations etc we multiply 415 with squareroot of 3 to get actual total line voltage which is a sine function of phase angle between them.
 Is This Answer Correct ? 24 Yes 3 No
S Singh

Re: If single phase voltage level is 230V than why three phase voltage level is not 660V ?, but it is only 440V.
# 10
that is where frequency does matter, because with frequency one of the three phase become neutral after a timeperiod. so for that reason at a moment two phases are showing 440v in pakistan).
 Is This Answer Correct ? 1 Yes 1 No

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