The line voltages, which by definition are the voltages between any
two lines, are indicated by K
RY
, Vy
B
and V
BR
.
The voltages between any one line and the neutral conductor are
called phase voltages and are indicated by
K
R
,
V
y
and V
B
.
Examination of Figure 20.11 shows that the line currents /
R
, /
Y
and
I
B
will be equal to the respective phase currents. IN this system, if
V
L
= line voltage and V
P
= phase voltage
then
V
L
=
V(3)V
P
(V3 is taken as 1.73 throughout this chapter)
and
/L = /P
where I
L
= line current
/
P
= phase current
If the load is balanced, i.e.
R i = Ri
—
Ri
then
v
R
=v
Y
= V
B
/
R
= /
Y
= /
B
^RY
=
^Y ...
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