Balanced star connected circuit measurements

  • Engineering
  • Thread starter Steve Collins
  • Start date
  • #1
Measure phase and line voltages.
Measure currents in the three lines and neutral.
Measure total power dissipated in the load.
Calculate total apparent power absorbed by the load.
Determine power factor.
Draw phasor showing voltages and currents.


P=P1 + P2

Q = √3(P2 - P1)

|S| = √(P2+Q2)

θ = tan-1(Q/P)


Measurements taken

VP = 150V

VL = 265V

IL = 2.5A

IN = 0A

P1 = 645W

P2 = 645W

So,

P = 645 + 645 = 1290W

Q=√3(645 - 645) = 0 VAR ???
 

Answers and Replies

  • #2
After a brisk walk to the shops in the snow I have realised that this is a purely resistive circuit so there is no Q or power factor.
 

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