Answer / subbarayalu

The normal method
of expressing transformer impedance is as a percentage voltage drop in the
transformer at full-load current and this reflects the way in which it is seen by
system designers. For example, an impedance of 10% means that the voltage
drop at full-load current is 10% of the open-circuit voltage, or, alternatively,
neglecting any other impedance in the system, at 10 times full-load current, the
voltage drop in the transformer is equal to the total system voltage.

Answer / anonymous

It is because three phase system is most economical out of all possible polyphase system configurations...that's it...

Answer / sokib

why did electric polyphase system commonly using three phase
system? is there any electrical system more than three phase
system?

Answer / 7anoter4

Usually group of transformers presents the same short-
circuit reactance in %
For instance, for S[ rated power] up to 2500 [to 3000] kVA
the percent reactance will be vk%=4-8. Ohmically calculated
reactance will be V^2/S*vk%/100 [ V=rated voltage].
For V=10 kV and vk%=6 for S=500 kVA Xk=10^2/0.5*6/100=12
ohm
For V=6 kV and vk%=6 for S=3000 kVA Xk=6^2/3*6/100=0.72 ohm
As one could see it is more convenient to consider only
vk% instead of ohmic reactance

in power generator normaly voltagr betwween esth to neutral is 0 but my work place generator show the volatge is 60v any body know why? thanks

0 Answers  

---

How much ph is maintained of water electrolyte which is used in LRS for 1200 kw slipring induction motor ?

0 Answers   AMS, JK Lakshmi Cement,

---

What is the function of pulse transformer?

4 Answers   Electrotherm,

---

when the Transmission and Distribution network where is the "feeder" lines are located? and why should be used in T&D network.....

0 Answers  

---

What is the maximum breakdown voltage of 11KVA and 66 KVA power line and how it is calculated?

0 Answers   Anglo Platinum, Narnarayan Electrical,

---

why we use star connection on the primary side of a transformer?

5 Answers   DRDO, TCE,

---

a transformer runs by electro-induction principle like all motors.then why dosen't it rotate just like any other motor

2 Answers  

---

WHERE CAN I GET THE PREVIOUS QUESTION PAPERS OF Govt Polytechnic in deee 2nd year papers

0 Answers  

---

what is the difference between KW and KVA?

15 Answers  

---

what is the difference between 2 way and 4 pole selector switch???

0 Answers   Allied Group,

---

Explain role of Buckolz Relay in Transformer ?

7 Answers  

---

Radio Carbon dating is used in a) find diseases b) find the age of relics c) find the carbon content in the atmosphere d) none of these

2 Answers  

---