Answer / kj

Tap changing is to change the ratio of the input voltage to
the output voltage. This changes the output voltage.
When the load on a power line changes the voltage changes
as well because of a reduced or increased line losses.
The tap changing means the output voltage can be controlled
to be as close to the desired voltage. Otherwise serious
high or low voltage could be experienced.

what ever the ups kva it may 500 kva or 500 va always out put is AC 240 volts its right?

3 Answers  

---

what are the compensations considered while designing a transmmision line.

1 Answers  

---

What is Surge Capacitor? Why it is use in Generator Circuit Breaker?

0 Answers   TCS,

---

calculate multiplication factor of a trivector meter with line ct ratio 200/5A, line PT ratio 11000/110V and meter CT ratio 200/1A and meter pt Ratio 11000/110V.

4 Answers  

---

why AC signals are represented by sinusoidal waveform?WHY other waveforms not used for representation

4 Answers  

---

can we charge 3 ph power transformer delta-star wound with neutral grounded 6.6kV/415V from secondary side(415V) but with primary(6.6kV) open by dg,what are the disadvantages or losses.

1 Answers  

---

what is the difference between indoor & Out door substations

5 Answers   HSBC,

---

what is over frequency protection

1 Answers  

---

We have one Energy meter for Measuring the voltage,current,power,energy(KWH,KVARH,KVAH) & power factor.The problem is that the meter does not show whether the PF is lagging or leading.So i want to know that is there any way or calculation to find out that whether the PF sign (lagging or leading) depending upon the above mentioned parameters?

4 Answers  

---

why can the rotor of 3 phase slip ring induction motor not be a 2 phase rotor?

0 Answers  

---

what is linear motor?

2 Answers   Lucas TVS, wbsedcl,

---

i have seen a picture of a power plant. in that pic. i saw chimney like giant structure which were spreading smoke like something...i want to know is it chimney or cooling towers, as my friends use to say.

2 Answers  

---