Asinglephase transformer has the following
nameplate data:
rating 150kva
primaryvoltage 7.2kv
secondaryvoltage 600v
frequency 60hz
whenoperating at rated load (full load) the
following lossesoccur:
hysterisisloss 550 w
eddy currentloss 400 w
total copperlosses 1800 w (primary + secondary)
thetransformer is to be used on a 50 hz system with
the restrictionthat it is to
maintain thesame maximum core flux density and the
same total losses. thiswill
result in thesame full load operating temperature.
determine:
(i) the newprimary and secondary voltage rating at
50 hz;
(ii) the newkva rating of the transformer of the 50
hz.