how to calculate the ac and dc wire losses with calculations
plz tell me
- 3 Answers
- 4532 Views
- Apollo, I also Faced
- E-Mail Answers
Answer Posted / 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.
| Is This Answer Correct ? | 2 Yes | 0 No |
Post New Answer View All Answers
Advantages/Disadvantages of earthing of neutral bus on MSB instead of separate neutral earthing for transformer/DG sets feeding to MSB
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?
What is creepage distance..... what will be the value for different voltage level
We are designer please help me calculate the size of 11kv cables from step up transformer to M.V panel, total load is 5 mega watt distance 900 feet (used aluminum type cables) please provided formula for calculate the cable with example.
what is the Earth Voltages in Power Plants, Sub-stations, Industries, Residential & Commercial Buildings.
how much leakage current is allowed in MC61A L&T make relay?
how to calculate sizing of NGTR (Transformer rating,Loading resistor value and Current rating of resistor) and what is the X/R ratio. Details : 11kV,Capacitance 1.73532 micro farads,40kA for 1sec.
Battery is a voltage source? give one example of current source and why?
How to calculate MCB Breaking capacity.
Define what is power quality meter ?
What will happen if i used 11KV earth ht kit to 11 KV / 11 KV cable termination?
Why open circuit test of transformers is conducted at rated voltage??Why not any other voltage??
what are the ''pitting rings''and how cn they be controlled in a series generator
difine electrical ballast in HPSVL
how you configure motorvision relay (L&T make)from DCS
