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

can anybody give me current carrying capacity of cables e.g size of cable in sq.mm & its current capacity both alluminum & for copper

4 Answers  

---

Up to how much limit of HP of electric motor the Star- Delta Starter can be used ?

1 Answers  

---

If current and resistance in a circuit is increased by 20%, what will happen to its voltage drop??

4 Answers  

---

How Many Safety of Transformer

2 Answers  

---

what happen if drive input fail momentry at 48.5 HZ frequency?

0 Answers  

---

---

discuss thyrister convertor type of AVR.

1 Answers  

---

is oil viscosity affect on motor current?

0 Answers  

---

transformer losses

1 Answers  

---

freuency meter

1 Answers  

---

Distribution transformer we provided 2 separate earthing pit for Body and 2 separate earthing pit for neutral,we can not connect separate body earthing pit to other earthing pit but we do metal glanding in secondary side cable termination in both side, transformer and PCC panel (LT Panel), is this safe for transformer and other equipment?

0 Answers  

---

what is the different betweem earthing and neutral?

8 Answers  

---

Is there any difference of regulation of transformer, alternator , transmission line, if yes, what is it?

1 Answers  

---