Answer / krishan chand tyagi

Transfomer overfluxing can be result of
1. Overvoltage
2. Low system frequency
A transformer is designed to operate at or below a maximum
magnetic flux density in the transformer core. Above this
design limit the eddy current in the core and nearby
conductive components cause overheating which within a very
short time may cause severe damage.The magnetice flux in
the core is proportional to the voltage applied to the
winding divided by thhe impedence of the winding.The flux
in the core increase with either increasing voltage or
decreasing frequency.During starrtup or stardown of
generator connected transformers, o following a
loadrejection, the transformer may exeperience an excessive
ratio of volts to hertz, that is, become overexcited.

why neutral used in three phase motor connection?

3 Answers   BEL,

---

what happen when transformer connect on dc supply.

5 Answers  

---

WHAT ARE THE CHARACTERISTICS OF AN VOLTAG AMPLIFIER

0 Answers  

---

What is mean by spike arrester(Voltage Operated)

0 Answers   Siemens,

---

what is the difference between ac and dc generator

14 Answers  

---

why we use condenser in the thermal power plant, althrough the same vapour will be again heated

2 Answers  

---

What should be the height of basement according to NBCC code?

0 Answers  

---

Why are transmission lines multiples of 11? Is it because of some historic reason ? Or is there a scientific base to it?

5 Answers  

---

Mathemetical Relation Between KWRH and KWH?

3 Answers   UPPCL,

---

Why armour HT XLPE power cable required to Earth?

1 Answers  

---

Why mostly the HV side of transformer has Delta?

0 Answers  

---

What is breather? why we use it ?

3 Answers  

---