Thus, at a load power factor of 0.5, one of the wattmeters has given zero reading. This has been
explained earlier under the effect of change in power factor on wattmeter readings.
9.8.4 Star to Delta and Delta to Star Transformation
Load impedances may often be connected in either star or in delta. It may be necessary to convert
star connected impedances to equivalent delta or delta connected impedances into equivalent
star for the purpose of circuit analysis. The formulae for such conversion are given as follows.
Conversion of Star Load into Delta Load
R
BY
Z
R
Z
Y
Z
B
R
BY
Z
BR
Z
RY
Z
YB
Figure 9.20 Star to Delta Transfor ...
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