Electrical Engineering - Three-Phase Systems in Power Applications - Discussion
Discussion Forum : Three-Phase Systems in Power Applications - General Questions (Q.No. 12)
12.
Compare the total copper cross sections in terms of current-carrying capacity for a single-phase and a three-phase 120 V system with effective load resistance of 15 
.
.Discussion:
20 comments Page 1 of 2.
N.D. said:
5 years ago
In the three-phase system, one phase will carry current while the remaining two phases will act as a return so current required per phase will be proportional to 8A.
In the single-phase system two-conductor will be required per phase so so current required per phase will be proportional to 16A.
In the single-phase system two-conductor will be required per phase so so current required per phase will be proportional to 16A.
(1)
Suyash kumar chaurasiya said:
9 years ago
@Ayush.
If we have a single phase power then for finding the three phase power we are simply multiply by 3*1 phase power so how can you say that if 3 phase current is i then one phase current is 2*i, explain it?
If we have a single phase power then for finding the three phase power we are simply multiply by 3*1 phase power so how can you say that if 3 phase current is i then one phase current is 2*i, explain it?
(2)
Ayush Kumar said:
9 years ago
Since for 3phase current = 120/15 = 8A & for single phase current = 2 * phase current because in this case two wire remains & therefore required single phase current = 2 * 8 = 16A.
(2)
Ogunjimi Biliaminu said:
2 years ago
For, 3phse p = vSq/R = 120sq/15 = 960watts.
960 = line current x line voltage x cosine θ x 1.732.
Line current = 960/166.272 = 5.77A;
For a single phase l = V/R. 120/15 = 8amps.
960 = line current x line voltage x cosine θ x 1.732.
Line current = 960/166.272 = 5.77A;
For a single phase l = V/R. 120/15 = 8amps.
Manash said:
1 decade ago
The proper choice of a resister to determine a wanted current flow in a particular circuit is knows as effective resistance.
Prabha said:
7 years ago
Single phase means ph and neutral how would be taken neutral as a phase?
Please explain it, I didn't understand.
Please explain it, I didn't understand.
Krishan Kant said:
1 decade ago
What is the meaning of effective load ?
Is it in star or delta and the factor must be sqrt (3).
Is it in star or delta and the factor must be sqrt (3).
Vinod said:
7 years ago
In three phase balance system, the current through neutral must be zero. How 8A will flow?
Azhagar said:
1 decade ago
@Black-menace.
3ph curr = 8A which is for per phase. If 1 phase (2 wires), So 2*8 = 16.
3ph curr = 8A which is for per phase. If 1 phase (2 wires), So 2*8 = 16.
Gopalan said:
9 years ago
I am not clear with the question and answer. Please help me to understand.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers