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

What should be the voltage between neutral and earth of a UPS?

4 Answers  

Please tell me if you are electrical engineer,and you are appointed for the maintainance of Electrical Power plant,then which parts of the plant deal with you.Also tell how these parts/components work.

1 Answers  

what happen when we add mentos in cold drink?& why?

0 Answers  

Difference between KW & kVA

7 Answers  

How can we find out LT UG cable fault (size,from-4*25mm sqr to 4*300mm sqr)? How mani types UG cable faults?

0 Answers  

WHAT IS THE SPECIFICATIONS CONSIDERED DURING DESIGN FOR THE OVER CURRENT RELAY?

3 Answers  

how to find the transformer neutral copper earthing size 

1 Answers  

What are the Return ( Monthly / quarterly/ Annual submitted to Electical Inspector for an establishment (Factory in Maharashtra-- Small scale category having seperate HT line of 22KV ) as per Maharashtra Electricity Act

0 Answers  

what is surge impedance loading?

1 Answers  

Testing procedure of DG alternator stability test

0 Answers   Amprotec,

WHAT IS IEC? & WHAT IS BENEFIT TO PRODUCT FROM IEC?

0 Answers   BMC,

Explain the different regions in frequency response?

0 Answers