Answer / 7anoter4

The losses of an insulated conductor in a cable –see, for
instance IEC 60287-1-1- or Neher and McGrath-are losses in
conductor, losses in insulation-dielectric losses-losses in
shield –eddy current and circulating current losses-losses
in armor, losses in metallic conduit.
Losses in conductor w=I^2*R in d.c. R=ro*length/cross
section ro is the resistivity at loaded conductor
temperature T.
ro(T)=ro(20dgr.C)*(1+a*(T-20)) a=temperature coefficient
of resistance.
Or ro(T)= ro(20dgr.C)*(T+K)/(K+20) for copper conductor
K=234.5 for instance.
In a.c. you have to add two other factors: skin effect and
proximity effect.

Answer / 7anoter4

ro(T)= ro(20dgr.C)*(T+K)/(20+K) T=conductor final
temperature in dgr.C

Answer / k.prakashchandra

I^2R

What is error of a measurement?

0 Answers  

---

what is the difference between scaler and vector control in drive and where it is to be used ?

1 Answers   Essar, TCS,

---

State kirchoff voltage law?

0 Answers  

---

what is disadvantages of high power factor

4 Answers  

---

how we can varying the speed of dc motor ?

6 Answers  

---

---

For these 2 devices what their power ratings are ? 1) single phase : AC 220V & starting amps 3Amps (i.e. starting torque) and the stabilized amps 2A ... For deep freezer 2) single phase : AC 220V & starting amps 2.7Amps (i.e. including the starting torque of a CRT monitor) and the stabilized amps 1 Amps thanks

1 Answers  

---

What will happen to the protection and metering, if the polarity of a single or two PT/PTs in three phase system is reversed? Please provide reference if any.

0 Answers   Mind Tree,

---

What is the advantage of AC supply?

5 Answers   PSU,

---

what is proper capacitor placement? How to evaluate capacitor size?

0 Answers   CPCL,

---

how to calculate the ct burden?

1 Answers   Hydropower,

---

What is auto transformer?

7 Answers   L&T,

---

What is the main purpose of c.f.b.c.boiler

0 Answers  

---