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

slipring induction motor starting time Lrs operating why lrs starting time lrs outer body didn't get shock

0 Answers   Ramco,

Is VVVFD reduced the starting current of an induction motor?

1 Answers  

it is difficult to interrupt a capacitive current because (a)it has a leading power factor (b)current magnitude is very small (c)the restriking voltage can be high (d)stored energy in the capacitor is high

2 Answers   DGVCL Dakshin Gujarat Vij Company, MGVCL, UGVCL Uttar Gujarat Vij Company Ltd,

what is use of capacitor in fan

8 Answers   ABB,

WHAT IS A COLOUR CODING OF 3 CORE CABLE

11 Answers  

How to calculate the breaking capacity(like 15ka,20ka) of Circuit breaker (MCB,MCCB,ACB)

9 Answers   Career Excellent Sdn Bhd, Neona, Northern Max Engineering, Sps Renewables, Terasaki, UEM,

If u have 60KVA UPS, than tell me how systems ( computers ) u may connect?

3 Answers   Thomson Reuters,

why need to be maintain power factor for industrial customer?

2 Answers  

what is the relation bw voltage and F in capacitor?

3 Answers   TATA, Tata Motors,

We have 11kV/110V three phase indoor potential transformer in 66/11kV Sub-station, where the failure of PT is frequently happening and the rating of the PT is 0.2 class accuracy, with primary star and seconday (two cores) star connected. Some experts has suggested to not to connect the PT Primary neutral to the ground because when transformer neutal NCT connection is loose; the faulty current will flow through the PT primary neutral, resulting into failure of PT. My question is: Is it necessary to remove the primary neutral connection of the PT from ground? if not, what would be the reason for failure of PT. Please guide me.

2 Answers   KPTCL,

If I have 3 essential main switch board and 3 incoming electricity ,but only 1 genset running is that possible.

0 Answers  

how can we calculate the reactence of the current transformers?

0 Answers