Answer Posted / shiny

The tendency of the AC current to concentrate along the
surface of the conductor is called skin effect.
The apparant resistance of AC is always higher than
DC .The alternating magnetic flux created by an ac current
interact with the conductor , generating a back emf which
tend to reduce the current in the conductor . The center
portion of the conductor is affected by the greatest
number of lines of force.The electromotive force produce in
this way by self inductance varies both in magnitude and
phase througr the cross section of the conductor, being
larger towards the centre and smaller towards the outer .so
the flow of current is maximum in the outer surface of the
conductor ,called as skin effect

In dC there is no inductance an dno skin effect.

Why are the laminations insulated from each other?

1143

---

What are the advantages of using distance protection schemes as opposed to normal overcurrent/ earth fault protection on high voltage feeders.

3571

---

Can you any one explain application of buccholz relay operation and pressure relif device operation of power transformer

1842

---

What are the advantages and disadvantages of open loop control system?

1094

---

is it possible to test of bus bar in high rise building without completed full floor ?

1676

---

how to size H.T & L.T Panel ?

2111

---

How to calculate Temp from Resister from PT100 equation,

1746

---

what is ratio of copper wire size and current ?

1812

---

How capacitor improves pf

1693

---

What are all present producing cost of Per KWH of various Fuel?

2585

---

what are the usual topology of transformers at different substations in the power system and why that particular topology is choosen. what are the limitaions of that topology?

2096

---

What is EMC filter in VVVF Drive ?

2718

---

Discuss about gear cutting machines.

1206

---

what is magnetizing and demagnetizing current in generator and motor?

3258

---

static chagre

2152

---