Answer / vinod

1) The Efficiency of the transformer depends on copper
loss and core loss, prepotional to the voltage & square
ampere.also power factor is depend on load. thats why
transformer is rated in KVA.
2) CT secondary is either connected with relay/ICT or it
will be shorted as it is working as step up voltage
(dangerously high) principle, cause human/equipment damage
PT is using as a voltage measurement and
protection,winding must be open or connected with load of
rated burden.

Answer / guest

when open circuit test of transformer we will got the iron
loss it will depends upon voltage and during short circuit
test we will got the copper loss it will depend upon
current there fore total loss in VA so we use large
capacity of transormer hencetransformer capacityis in KVA.
2)if ct secondary is open heavy emf will produced so
sarrounding equepement will burntout and CT willalso burnt
or saturated.

Answer / venkat

we dont know transformer manufacters the load power factor
cosumer so the trasformer rating in KVA

power is the product of voltage and current.so we can measure the value of power just by using ammeter and voltmeter.......then why do we use a wattmeter?

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