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Newnes Circuit Calculations Pocket Book
book

Newnes Circuit Calculations Pocket Book

by Thomas J. Davies
April 2016
Intermediate to advanced content levelIntermediate to advanced
384 pages
12h 56m
English
Newnes
Content preview from Newnes Circuit Calculations Pocket Book
Two-
and three-phase systems 357
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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Publisher Resources

ISBN: 9781483101132