Answer / shariff

It can be step down from 66kV to 440V,but the problem is
above 33kV power transformers will be in treated as EHV,
and normally they will carry loads in terms 20 or 12.5MVA
etc. then for e.g for 20MVA the sec. current with 440V will
be 20x10E6/440=45kA( Normal rating), where this power
transformer cant be made practically with huge cuurent. So
practically we will go for 66kV to 11kV normally, where
Current is the limiting factor...

Answer / k.prakashchandra

Inside a factory it is feasible.But for public utility you
can not erect regular 66KV/433V substations say ,every 500
meters, as long LT distribution lines can not drawn in view
of current and voltage drop.

Answer / yogender goel

It increases the power transmission cost very high.

Answer / jaheerabbas

if we are converting the 33Kv to 440v directly, wastage of
power is more in the form of heat,so that we required large
no of heat sink too....heat sink cost will be more compare
to transformer, so that we go for the step by step convertion

Answer / lakesh thakur

when we convert 66kv to 440v directly then transformer size
will increase & loses will also increase. So we should
increase the size of heat sinke. So directly we can say the
cost of whole our project will increase & also increase MVA
rating

Answer / ved prakash

Basic insulation level at HV & LV side is also a big factor.

Answer / ramki

fulls , there is mutual coupling in between the windings , so for 66/33/11/133..like this we can found the mutual coupling as a nearly 1.......so wethis

What is mean by discrimination of circuit breaker ?

1 Answers  

can we step up dc power using transformer?

15 Answers  

Basic motor transformer generator

0 Answers   eCentric Solutions,

What are your future plans for the company if permanently employed?

0 Answers  

dg earth connect only in the amf panel or not why

0 Answers  

What is stub protection is all about?

1 Answers  

Why we are putting off the APFC(automatic power factor control) panel while the generator is running?

4 Answers   National Steel,

- two pumps must work with them at the same time but if the first pump start the second pump  must delayed for some time to start  also , with motor rated power = 90 KW and rated voltage = 380 V and rated power factor = 0.85 lag please draw the power and control circuit for it and determine all circuit components parameters that you use it

0 Answers  

Why you want to join non technical field when you are an engineer?

0 Answers  

how i can calculate the size for fire cable

0 Answers   Adani Power,

please I wont know how to calculate the vector group for power transformer ZNyn11 best regard.

0 Answers   Al Rasikh,

why it is not advisable to run low rating (19KVA) DG sets in parallel for long durations even though they are provided with droop ckts (QDC)

0 Answers