Interested to Buy Any Domain ? << Click Here >> for more details...
what is the role of impedance in transformer?based on
secondary f.l.current(139 amps) and impedance(4.07) of
415/415v of 100 kva transformer. what is the primary
current?
- 1 Answers
- 5891 Views
- I also Faced
- E-Mail Answers
Answer Posted / ma.amulraaj,b.e. mba.,
It is %impedance Voltage.In Transformer,%impedance Voltage plays significant role .Here 100KVA,11KV /415 V.
Full load current Sec .current= VA / 1.732x V (Sec.Voltage)
=(100x 1000 )/(1.732x415 ) =139 Amps, ok
Full load current Primary .current= VA / 1.732x V (Primary
Voltage)
=(100 x 1000)/(1.732 x 11000)
=5.25 Amps
Here ,the full load secondary current is 139 Amps,the rated secondary voltage is 415 V,we can do Short circuit test by applying secondary voltage 415 V,we cannot get the full load secondary current,due to impedance of Transformer.Then we have to raise the secondary voltage gradually, at particular voltage it delivered the full load secondary current,note down the voltage say 440V.From that voltage we have to find out % impedance.440 /11000 = 4% %Z=4.0 %.As this case %Z=4.07,ie. it is (4.07 x11000)/100 =447.7 V.It means This transformer may delivered a full load current at 447V.
This % Impedance may vary from Transformer to Transformer.
| Is This Answer Correct ? | 3 Yes | 1 No |
Post New Answer View All Answers
What are the insulation standerds for eg H clase and how many insulation standerds are there and its standerds??????
why impudance relay used for medium transmission power system? why not others?
What is the formuala to calculate the rating of motor protection circuit breaker
what is the ms flat constant for calculating earth mat design calculation?
why the arc welding machines require parallel earthing systems? ie why each machines are connected to earth pit by separate wires during earthing? wats it adavantages?
why current is constant on d.c?
EXPLAIN USE OF ROCKING ARRANGEMENT IN ELECTRIC HEATING?
Is it true that in the 3 phase transformer, the limbs of the core are at 45 dgrees to each other. if true, why?
What about electrical Units. discrive in detail
How to calculate LT XLPE CABLE for 11 kv / 433 v , 1000 kva oil type transformer system?
how the characterstics of control valve being done
why the carbon brushes are broken in srim while the motor runningtime
WHat is the general checks required for Dry type transformers
my question is how to answer the question "you are from b.tech eee background and why do you want to go for banking
How npn and pnp transistor works
