Voltage drop calculation for radial supply system

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SUMMARY

Voltage drop calculations for a radial supply system involve determining the total load line current using complex numbers. The example provided calculates the total load as I = 1.5/−60° + 2.3/−18°, resulting in a total current of 3.56/−34.4° MVA. The calculations break down into real and imaginary components, yielding values of (0.75−j1.3) and (2.19−j0.71). This method is essential for ensuring efficient power distribution in electrical engineering.

PREREQUISITES
  • Understanding of complex numbers in electrical engineering
  • Familiarity with voltage drop concepts in radial supply systems
  • Knowledge of phasor representation of AC currents
  • Basic skills in electrical load calculations
NEXT STEPS
  • Study the principles of phasor addition in AC circuits
  • Learn about voltage drop calculations in three-phase systems
  • Explore software tools for electrical load analysis, such as ETAP or PSS/E
  • Investigate the impact of conductor size and length on voltage drop
USEFUL FOR

Electrical engineers, power system designers, and students studying electrical engineering who need to understand voltage drop calculations in radial supply systems.

wsharrock
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Voltdrop calculations are made as shown below.

Total loadLine currentI=1.5/−60∘⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯+2.3/−18∘⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯
=(0.75−j1.3)+(2.19−j0.71) <<< (How to get to these numbers only from above??)
=(2.94−j2.01
)=3.56/−34.4∘⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯MVA
 

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wsharrock said:
Voltdrop calculations are made as shown below.

Total loadLine currentI=1.5/−60∘⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯+2.3/−18∘⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯
=(0.75−j1.3)+(2.19−j0.71) <<< (How to get to these numbers only from above??)
=(2.94−j2.01
)=3.56/−34.4∘⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯MVA
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