1. Develop 3-Phase Radial Load-flow Program & set up Feeder Model. a) Develop a
ID: 2248416 • Letter: 1
Question
1. Develop 3-Phase Radial Load-flow Program & set up Feeder Model.
a) Develop a radial load flow program and set up a uniformly distributed load feeder model of 10
equal loads. Total feeder load = 100 kVA (3-phase), at peak, operating at 0.9 power factor agging. Total feeder length = 500 m. The cable impedance = 0.315 +j0.365
ohms/phase/kilometre. Use the residential load curve (refer Addendum).
b) Run your load flow. Are current and voltage constraints being exceeded? Current constraint =
200 A/phase; voltage constraint = 415 V +/- 5%. If the supply end voltage was raised above 415
V would this solve any peak load?
c) Now, run the load flow for light-load conditions = 30% of peak load conditions (use residential
load curve). Are voltage constraints being exceeded? Record all your feeder current (supply
end) and voltage drops. If the supply volts is raised as in 1(b) are voltages too high in light-load
conditions?
d) The load at node #10 is a large induction motor and is a fluctuating load. Its starting current is 5
times its normal running load (as in part 1(b)) and starting power factor is 0.4 lagging. Re-run
your load flow and determine the change in voltage drop, at both node #9 and node #10. Is the
voltage drop at node #10 > 10%? Is the voltage drop at node #9 (the “common point of
coupling”) > 4%?
Explanation / Answer
set up Feeder Model.
a) Develop a radial load flow program and set up a uniformly distributed load feeder model of 10
equal loads. Total feeder load = 100 kVA (3-phase), at peak, operating at 0.9 power factor agging. Total feeder length = 500 m. The cable impedance = 0.315 +j0.365
ohms/phase/kilometre. Use the residential load curve (refer Addendum).
b) Run your load flow. Are current and voltage constraints being exceeded? Current constraint =
200 A/phase; voltage constraint = 415 V +/- 5%. If the supply end voltage was raised above 415
V would this solve any peak load?
c) Now, run the load flow for light-load conditions = 30% of peak load conditions (use residential
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.