Answer / tango

basically to obtain the desired voltage at the secondary side
tap is used , the voltage variations at the primary side
results the variations at the secondary side according to
transformation ratio, if the voltage at primary side is more
than rating then no of tuns to be reduced and vice versa if
voltage is less so the no of turns has to be increased so as
to get the exact rated voltage at the primary side.
hence to keep voltage at the rated one needs tap changer for
altering the no of turns. Tap changing is done normally for
+5% to -5%, but some times upto -10% in steps of either 2.5%
or 1.25%.

Answer / apoorv

there are different tap changers in transformers. diff. taps have diff. no. of turns , therefore suitable voltage output can be obtained , allowing good voltage regulation.

how to calculate

0 Answers  

---

what you have to see after one week or month from the day of installation of transformer ?

0 Answers  

---

i've iocl interview.. if you know the interview process please give me information..

0 Answers  

---

3phase 4 wire system is more reliable or 3 phase 3 wire systems?

4 Answers  

---

I have 11KV/415V power distribution transformer. I have found unbalance current in LT (415V) side. Also observed that unbalance voltage (3V) at LV side due to HV side unbalance voltage. What should I check for this? Also, the same LV side load can run in balance on captive power.

1 Answers  

---

can you send me the placement papers of electrical engg. from companis like NTPC,DRDO,IOCL,HPCL,BPCL etc.?If,plz send as soon as possible.Thanks.

0 Answers   NTPC,

---

What is transposition in a transmision line?

2 Answers  

---

what is power and what is watts detailed description and formulas

2 Answers  

---

how to erect roof control panel?

0 Answers  

---

Which standard i will refer for size of earthing conductor for equipment? (Eg:415V Switchgear, MCC, DB shall be 50x6mm GI flat)

1 Answers  

---

what is the speed of current?

29 Answers   Su Kam, TATA,

---

why -48 volts dc used in telecommucation

0 Answers  

---