Answer / siva

MVa Rating is Depends upon the Load when Load is
increased current will increase so we design for different
rates of Mva Depends upon the load

S= 1.732* V*I for Ex 50 MVA

50* 10^6 = 1.732* 220* 10 ^3*I To Calculate the I Value
is 131 in Hv side Lv side 218 A

Answer / j.karthik

The MVA rating is only based upon the generating MW capacity
of the plant.
For Example:
50MW is generated in the Powerplant.(i.e. Generator
capacity is:50MW,11kV,0.8P.F,3000RPM)
Now we like to connect this 50MW power to the E.B.grid
then we use one Step UP Transformer i.e. to step up the
voltage from 11kV to 220kV.
Now we can calculate the MVA rating of that step up
transformer as:
i) MVA = MW/costeta
MVA = 50/0.8 = 62.5MVA.

This is the answer.....

By,
Karthik(Engineer)

Answer / srikanth.kondru

very simple

we need to know the Load of the sub station ..
for example it is 1000 H.P
as we know that 1 H.P =1.5 amps
voltage is 220 KV
power ,p = 746KW = 1.732*0.8*220KV*I
I = 746 KW/1.732*0.8*220KV
= 2.4 amps
S=220*2.4*10^6 =532 MVA

Answer / milinda4p

The MVA rating of a power transformer depends on the load
connected to the transformers. this can be calculated (for a
grid transformer) by calculating the total MVA of the
primary substation transformers connected to it.Generally
this is calculated with a extra space for load connection.

Answer / k.prakashchandra

The present load and anticipated load growth in the coming
10 years.

Answer / raju

transformer is working only based on load. frequency was not changing, so it is called mva

which has more heat effect(dc or ac)

4 Answers   CCEL, TATA,

what is balanced network and unbalanced network

1 Answers   Nalco,

how many load we can take for lighting

0 Answers   ABB,

How we can recongnise the phase displacement of transformer connection between primary & scondary...plzzz explain it with example.........

0 Answers   BOC,

. How to calculate the Short Circuit Impedance in Transformer? How to calculate the Short Circuit Impedance in Transformer?

0 Answers  

what the effect will occur if we increase the airgap in induction motor

4 Answers   IES, Tanfac,

What are various accuracy classes of CT(Current Transformer)

1 Answers  

what is legal process of dg set?

0 Answers   Dutron Polymers,

If 110V DC Coil Contactor taken 15ma DC on load,than how much AC current wil be taken?

0 Answers   Lafarge, Shree Cement,

IF DISTANCE IS 100METERS B/W AMP.METER AND CURRENT TRANSFORMER WHAT WILL BE AFFECT IN ACCURACY .METER CAN SHOWING ACCURATE CURRENT OR NOT IF NOT WHAT CAN I DO TO GET 100% ACCURACY.

0 Answers  

full form of electrical?

0 Answers   CEAT,

Difference between HRG and NGR. Are they both the same thing

0 Answers