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Question
what is phase voltage and line voltage? in line voltage how 
415v is obtained?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
phase voltage is voltage between phase (R Y B) to Neutral.
& line voltage is Voltage between to phases like R & Y.
line voltage 415V.in star connection line voltage=phase
voltage*1.732=415v.
 
Is This Answer Correct ?    140 Yes 25 No
Ashish Patil
 
Answer
# 2
The voltage between line and neutral is called the phase
voltage. where the voltage between two lines called the
line voltage.
In star connection:
VL=1.732Vph

In delta connection:
VL=Vph
from above relation line voltage is obtain 415V in 3 phase
supply.
 
Is This Answer Correct ?    41 Yes 5 No
Vaishali Patel
 
 
 
Answer
# 3
When you have multiple phases (lines with voltages having
different phase angles)there different ways of defining
voltage. Say you have 4 lines: Line A, Line B and Line C
and Neutral. Now let's say you have a "3 phase" source of
480V connected to these lines. Each line represents
a 'Phase'.

If you were to measure the voltage between, arbitrarily
choosing Line A and Line B, you would measure 480V. Now,
if you were to measure the voltage between Line A and
Neutral you would measure a much lower voltage. Namely,
480V divided by the square root of 3. This difference
shows that each 'line' is not actually carrying 480V. But
when you reference one non-neutral line with another non-
neutral line you get 480.

This is because you are referencing two voltage lines that
are out of phase with each other (in this case 120 degrees
out of phase). Therefore, the voltages will not be
in 'sync' and the differences will result in higher peak
voltages (480 in this case).
 
Is This Answer Correct ?    36 Yes 6 No
Mark
 
Answer
# 4
phase voltage is the voltage when any of the phase (r,y,b)
is considered along with the neutral and then the voltage
is considered this gives te phase voltage ,

line voltage is the voltage is is measured between any two
phase .
 
Is This Answer Correct ?    39 Yes 10 No
Pravesh
 
Answer
# 5
Line voltage is the potential difference between two lines of different phases. This means there are actually 3 line voltages on a three-phase system; A-B, A-C, and B-C. For a balanced system, the three must be equal.

Phase voltage is the potential difference between a line and neutral. A three-phase system has three phase voltages as well; A-N, B-N, and C-N. For a balanced system, all three must be equal.

For three-phase Alternating Current (AC) circuits, there is a relationship between line and phase voltage that is defined by the connection method (wye or delta).

WYE:
(Line voltage) = (Phase voltage) * sqrt(3)
(Line current) = (Phase current)

DELTA:
(Line voltage) = (Phase Voltage)
(Line current) = (Phase current) * sqrt(3)

For single-phase circuits (AC and DC), line parameters (current and voltage) are the same as phase parameters. This is because one leg is referred to as having 'potential', while the other is generally referred to as the 'return' or 'neutral' or 'ground'.
 
Is This Answer Correct ?    15 Yes 2 No
Gurumoorthi
 
Answer
# 6
phase voltage is voltage between phase (R,Y,B) with neutral
and line voltage is voltage between two phase like R and y,
Y and B or B and R.
 
Is This Answer Correct ?    10 Yes 6 No
Dibya Jyoti Mishra
 
Answer
# 7
Let's get the terminology correct to start with.

The conductors that connect the load to the supply are LINES (or 'line conductors', NOT 'phases'! Which is why the voltages measured between them are called 'line voltages'.

PHASES are not conductors, but the connections, such as individual loads (or the windings of an alternator or transformer) between line conductors, or between a line conductor and the neutral.

So 'phase voltages' are measured between lines (in the case of a three-wire system) or between a line and a neutral (in the case of a four-wire system).

So we measure line voltages BETWEEN lines, and we measure phase voltages ACROSS phases.
 
Is This Answer Correct ?    0 Yes 1 No
L A Waygood
 
Answer
# 8
In star connection: Line voltage = sqrt(3) phase voltage.
In Delta =line voltagae = phase voltage

that means phase voltage is the voltage measured between
the phases e.g between R&Y Y&B R&B.and possible in both
star and delta.

Line voltage is the voltage measured between one line and
Neutral e.g between R&N Y&N B&N .and possible in star.
 
Is This Answer Correct ?    44 Yes 77 No
Will
 

 
 
 
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