Answer / ramakrishna

Losses in transformer cuper losses & iron losses.cuper
losses depends on current iron losses depends on voltagge.
total losses depends on va not depend on phase angle b/w
voltage & current

Answer / sarbudeen

all the devices (execpt loads like
motor) diesel generators,
transformers, ups are rated in kva
only,
it saying that i can provide total
power (kva) and its ur problem
how u split it (kw+kvar)
depending on load u provided. But
i can give this amount of total
power (kva).

Answer / rangan

THE PRODUCER DOES NOT NO ABOUT THE COSUMERS POWER FACTOR
DEMANED BY USING OF RESISTIVE LOAD ,CAPACITIVE,OR INDUCTIVE
LOAD THAT'S WHY TRANSFORMER REPRENTED IN KVA.

Answer / sanjayjssate

Because the only thing which doesn't change both side is multiplication of voltage and current. So if any one can calculate the other side values if he have n1 : n2 ratio and any 1 value, ie voltage or current.

Answer / 7anoter4

A power transformer contains two main part –the windings-
copper or aluminum conductors insulated –and the magnetic
core.

Magnetic core requires an excitation current in order to
maintain the required magnetic field.

The excitation current depends on supplied voltage and if
the supplied voltage is over a certain limit the excitation
current presents a threshold and start to be very high.
This voltage is the rated voltage.

On the other hand, the conductor insulation rated
temperature is limited-according to insulation class-since
above this limit the insulation will be damaged.

The temperature arise depends of the current passing
through conductor and producing heat losses. These losses
depend only on the absolute value of the current and it is
not connected to the active load [kw=volt*current*p.f. then
the maximum kw it is when p.f.=1 then kw=kVA].

The product of voltage with current is measured in VA or
kVA=1000 VA or MVA=1000000 VA.

Answer / 9040081102

As the transformer is not specified for a particular power
i.e active power or reactive power and the unit of acive
power KW and the unit of reactive power is KVAR for that
reason transformer rating is represent in KVA.

Answer / lokanna.adekar

Losses of transformer depends upon voltage

Can anybody tell the formula to calculate temparature rise in the cable with respect to current?

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