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Electrical Applications 2 by David W. Tyler

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78 Transformers
Example
6.
A load of
25
kVA with power factor 0.6 lagging is
fed at
450 V
from a single phase supply.
A voltage transformer with ratio 4:1 and a current trans-
former with ratio 100:5, together with a wattmeter, are used to
measure the power in the circuit. Determine: (a) the potential
difference across the wattmeter voltage coil; (b) the current
flowing in the wattmeter current coil; (c) the indicated power
on the wattmeter.
PROBLEMS FOR 7 What are the advantages of forming a transformer core
SECTION 5 from a continuous strip of cold rolled grain-oriented steel as
compared with building it up from lamination