Page 559 - Basic Electrical Engineering
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wattmeter, a voltmeter, and an ammeter are connected to the low voltage side
as shown in Fig. 6.19 (a).
The equivalent circuit of the transformer has also been shown under no-
load condition in Fig. 6.19 (b). The wattmeter connected on the L.V. side will
record the input power, W to the transformer. The supply voltage is
o
measured by the voltmeter and the no-load line current is measured by the
ammeter reading, I . The input power, W is
o
o
From the equivalent circuit on no-load [see Fig. 6.19 (b)]
