Adding equation (5.4) and equation (5.3), we get the following form:
R
A
ABCA
ABBCCA
=
++
RR
RRR
Similarly, the values of R
B
and R
C
can be calculated.
When delta connected resistances are changed to star connected resistances, their values are
given as follows:
R
RR
RRR
A
ABCA
ABBCCA
=
++
(5.5)
R
RR
RRR
B
ABBC
ABBCCA
=
++
(5.6)
R
RR
RRR
C
BCCA
ABBCCA
=
++
(5.7)
Example 5.13 Three resistance of values 1 Ω, 2 Ω and 3 Ω are connected in delta formation
between terminals AB, BC and CA, respec tively, as shown in Figure 5.45. Calculate the equivalent
star connected resistances.
Solution:
R
RR
RRR
R
RR
RRR
A
ABAC
ABBCCA
B
ABBC
ABBCCA
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