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)

How to distinguish between the armature wires with the field wires of a Dc motor ?

5 Answers  

From past few months I am getting lagging pf even though sufficient capacitors used in circuit. Where is the problem pls answer

0 Answers  

How to calculate the efficiency of Turbo Generator(Alternator) in general....?

0 Answers   Thermax,

what is legal process of dg set?

0 Answers   Dutron Polymers,

Why LVDT have secondary windings connected in differential 1. Higher out put 2. Based on the out put voltage-/+, helps to identify the direction of displacement 3. To establish a null/ reference point

1 Answers   GATE, PSPCL,

why do we use 25kv supply for traction purpose?

0 Answers   Bhel,

what is the length of air terminal in lightening arrester system.

1 Answers  

IF alternator SCR value will be high means what happen in alternator efficency at operating power factor of 0.8

0 Answers  

How to size fuse? How to size MCB?

0 Answers  

What is the criteria in selecting Air circuit breaker(ACB) & Moulded case circuit breaker(MCCB) for a particular range?

3 Answers   DLF,

whats relation b/w motor current & friqency

1 Answers  

What is the armature mmf in a D.C machine?

0 Answers   HPCL,