Answer / subra

In power transmission operating voltage are in K V
ie Kilo Volt
The transformers Capacity is in MVA ie Mega Volt Ampere
In power Distribution Network operating Voltage in KV kilo Volt
The transformer Capacity in KVA
Power in 3h = Root3 VxI ---VA
root 3VxI Cosphi----Watts
watts X 1000 =KW VA x 1000 = KVA
Watts x 1000000 = MW KVA X 1000 = MVA

Answer / subra

In the trasformer KV means kilovolt KV is operating voltage
ie 11Kv ,33kv,132kv,230kv,440kv this may be stepup or step
down.But MVA means capacity of the transformer mega volt
ampere.

Answer / kaarthikrt&c

significance of voltage n power,KV*I*1.732=MVA

Answer / kaarthik

if t/f power rating is 1 mva,prim volt=10kv,sec
volt=400v,,,prim current=(1mva/[1.732x10kv])=>57.7367
Amps,sec current=(1mva/[1.732x400])=>1443.4180,,,,,pls
correct it Mr.Eduardo

Answer / sagar singh

The ratings of a transformer is in MVA because due to the
losses i.e. core and iron losses.

Answer / eduardo

kV means kilo Volts, and is 1000 V. So 10kV means 10 000V.
This is the operating voltage. You must have another voltage
in the transformer. One is for the primary, and the other
for the secondary.

MVA means Mega Volt Ampere and is the power of the transformer.
1 MVA = 1 000 000 VA.

For example. If you have a transformer 10kV/400V and with 1
MVA, this means that at full charge is able to delivery in
the secodanry 1 000 000 VA / 400 V = 2 500 A.
He must be connect at a power line 10 kV and will delivery
400 V (till the load of the seconary reach 2 500A, after
that the value of the tension in the secondary begins to
drop, but this is another story).
In the primary the current will be 1 000 000 VA / 10 000 V =
100 A (at full charge).

Answer / deepu

Simply kv is used for
distribution and mva
for transmission
purpose

Answer / c.mahadevan

respected sir,
iam C.Mahadevan electrical engineer,in this
question i have to answer for the transformer mainly MVA
using for High voltage transmission purpose and reduces to
the losses(conductor loss,transmission cost).
KV means it is step down purpose and distribution lines.

Why are the voltage levels in a powersystem are 11KV,33KV etc., why not 10KV,30KV?

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