Answer / sripellirajukumar

hi this is rajkumar...
as per my knowledge
the primary side current can be calculate as follows
for example
we have power transformer of 5MW transformer and the 33\11kv
the primary current is (5000kv/33kv)/1.732=87.47amps
the secondary current is (5000kv/11kv)/1.732=262.43amps
here 1.732 is square root of 3....

Answer / cfanez

Girish,since the power is in MW,it means that we are looking
for current in consideration of power factor.If it were in
MVA,then the calculation given by Rajkumar is ideal.
5000kW=1.732*11*Ip*PF (assume pf =0.85)
5000=1.732*11*Ip*0.85
primary current Ip=308.7A
5000=1.732*.415*Is*0.85
Secondary currentIs=8,183.6A
Select cable capable from your table.If surface then
alluminum cable should be selected,if underground,suitable
hV cable should be selected to suit the primary and
secondary current carrying capacities respectively.

Answer / tasawar abbas

power factor panel calculation?
why I use the PFI panel in industry?
whose I select the kvar rating?

Answer / j.kesavan

check tr current in name plate py side after slect h.t
(xlpe)cable fix .

Answer / hosam

33000KV/11000KV 20MVA = 20000KVAX0.8=16000KW

1000kva H.V=52.5
L.V=1333.4
433V

Answer / perumalsamy o

5mva
I = 5000/33*1.732
I = 57.5A (HT amps 33 kv side)
 I = 5000/11*1.732
   =262.5A(HT amps 11kv side)

why the power factor of the induction motor is low?

1 Answers  

What is the difference between analogue electronics and digital electronics?

2 Answers   PSU,

What is corona ? Mention its positve effects .

1 Answers  

what is the diff between earth leakage relay and earth fault relay?

7 Answers  

what should we do when the CT secodary gets open? how do we short circuit it? using tester or screw driver? not dangerous?

6 Answers  

What is meant by stator?

0 Answers  

132/66kv sub-station procation ?

0 Answers  

What is the actual meaning between the energy conservation and energy saving ?

3 Answers  

What is the Diff. btw Fire Alarm System & VESDA System??????

1 Answers   Emerson,

What is the general power factor & min. power rating of TV,LCD type TV, CRt type TV, Scanner, printer?

0 Answers  

what is mean by hormonics & surge? and it's effects?

1 Answers   TCS,

What is the name and type of power transformer oil?

4 Answers