Answer / 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.

we all know that corona is nothing but ionization of air around the conductor and there by allowing current to pass through ionized air.but we are not getting any short circuit in between the respective phases though the air turned as a conductive media between them??

1 Answers   Siemens,

---

Why we use a shunt capacitor or synchronizing Motor To Improve a Power factor pls reply me in this mail dinesh_elect_eng@yahoo.com

4 Answers  

---

Will it be OK to connect a 5MVA 33/6.6kV Ynd11 Transformer to a Star connected Motor. Or on other words connecting a Delta to a Star. I have another 30MVA 33/11 Dyn11 and would it be practical to convert it to Dd0 consequently converting the Voltage Ratio to 33/6.35kV Dd0.

1 Answers  

---

In 110V DC supply,if a closed circuit gets open, How can we identify the voltage which is measured after the resistor(4KOhm) which is open with negative.it shows 55V +ve when measured, also the actual positive source is 55V +ve .Because there is no voltage drop in open circuit. How can we identify whether this is the voltage which is series with the resistor or the DC source direct +ve.

1 Answers   GE,

---

why transformer rating in KVA or MVA instead of KW n MW??

3 Answers  

---

---

WHAT IS THE ANALYSIS OF FREE WHEELING DIODE IN FULL WAVE CONROL RECTIFIER?

1 Answers  

---

what do you mean by every IC 74 first digit.why are you using this no.why not using another no.

0 Answers   Jaypee,

---

DIFFERENCE BETWEEN NORMAL TRAFO AND THRISTER TRAFO?

0 Answers   Essar, MahaGenco,

---

what is the diff. b/w balanced and unbalanced load..?

12 Answers  

---

what is lrs tank water resistance.

0 Answers  

---

what is the difference between LLL and LLLG fault ?

1 Answers  

---

What range of speed can you get with the armature control method of speed control of d.c. Shunt motor?

0 Answers  

---