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Balanced star connected circuit measurements

  1. Jan 19, 2013 #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


    P = 645 + 645 = 1290W

    Q=√3(645 - 645) = 0 VAR ???
  2. jcsd
  3. Jan 19, 2013 #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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