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 frequency response?

0 Answers  

---

How to design inductive load for 3 phase 440v and maximum 5 amps for star or delta? Can we use a 15kW, 1450rpm motor for 15kW, 960rpm apllication?If yes.how......n.if thesame motor used what`s it`s sideeefect.

0 Answers  

---

can any one provide some material?

1 Answers  

---

WHY THE COLOR OF OUTDOOR TRANSFORMER IS BLUE ONLY???

0 Answers  

---

What determines the thickness of the lamination or stamping?

0 Answers  

---

what is the value will come when megger the phase to phase ,phase to neutral ,phasae to ground ?

3 Answers  

---

Why we have short circuit the secondary of the transformer

1 Answers  

---

why is the earthing pin on 3 pin top are big and thick

3 Answers   Marriott,

---

Why there is restriction to generated voltage to certain limit for example (now 18kv) ?

3 Answers   College School Exams Tests,

---

why star point of HT motor not earthed?

0 Answers  

---

Tell me about Tesla.

1 Answers   Tata Power,

---

what is the 2MVA distribution transformer efficiency

1 Answers  

---