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 do we use 36KV LAS for 33kv line and 9KV LAS for 11KV line?

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