Answer / sewagudde

the automatic voltage regulator (AVR) senses changes in
voltage and sends a signal to the controller on the tap
changer to either raise or lower the tap.it should be noted
that the tap changer is always located on the HV side of
the transformer inorder to interrupt smaller currents as
compared to the LV side

Answer / debasis

There is controler which sence the voltage & give command
to a stepper motor that how many step(s) & what direction
have to go for achiving the required voltage.
And the changeover held inside a oil chamber to avoid
sparking.

Whether amorphous core transformer is available in India?.If available then up to what rating of voltage and KVA?.

0 Answers   DAE, Tata Chemicals,

---

Difference between DOL starter & star Delta Starter? And where the Dol starter used upto how much HP and whereas Star Delta vice versa?

3 Answers  

---

I had applied for JE in PSEB, Can you pls send me the Question bank for related to my field

0 Answers  

---

How to calculate Maximum Demand from Energy meter Reading.

1 Answers   Etisalat,

---

how many earthing is required for sever room?

4 Answers  

---

what is the ATS .And how it works.

0 Answers  

---

why transformer cannot rotate though the princplebehind induction motor is similar to a transformer?

2 Answers   GE,

---

why characteristics of overcurrent relay is time-->psm instead of time-->current?

0 Answers   ABB,

---

ther is any difference if we use 240 V A.C,50 Hz,1 Ph. in place of 230 V A.C,50 Hz,1 Ph.

4 Answers  

---

What is the relation between frequency and motor rpm?

0 Answers  

---

what is the difference between power transformer & distribution transformer and what are their ratings respectively?

4 Answers  

---

We have 11kV/110V three phase indoor potential transformer in 66/11kV Sub-station, where the failure of PT is frequently happening and the rating of the PT is 0.2 class accuracy, with primary star and seconday (two cores) star connected. Some experts has suggested to not to connect the PT Primary neutral to the ground because when transformer neutal NCT connection is loose; the faulty current will flow through the PT primary neutral, resulting into failure of PT. My question is: Is it necessary to remove the primary neutral connection of the PT from ground? if not, what would be the reason for failure of PT. Please guide me.

2 Answers   KPTCL,

---