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By L. Beranek

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A sample wiring diagram for the real-time three-phase power measurement. As shown above, only the phase voltages and the line currents are measured. The active, the reactive and the apparent power can be computed from these quantities after the phase angle is determined, which is the angle between say Phase 1 voltage and Line 1 current. The specifications of the hardware used The devices used in this experiment have the following specifications. Computer: Pentium PC , 32 MB RAM, and >1 GB hard disk, Data acquisition system: National Instruments AT-MIO-16E-10 data acquisition card with 8 differential inputs, 12-bit resolution, 100 kHz sampling frequency, 2 Analog Outputs (for 12-bit D/A conversion), 8 Digital I/O.

The final stage of the test is the estimation of the moment of inertia, J by using Equation 3-2, which requires the values of Ploss , J = Ploss ω • © National Instruments Corporation dω dt . Please note that Ploss data may vary considerable depending on the condition during the retardation test. The data file included in this VI contains three sets of measured data that are obtained at different field current values of the conventional brush DC machine in the lab, and is very much different for the other types of rotating electrical machines.

The second term on the right-hand side is called instantaneous reactive power, and its average value is zero. The maximum value of the second term is known as the reactive power, and it is measured in volt-ampere reactive (VAR), kVAR, or MVAR. Hence, the active power and the reactive power are given by P= Vm Im cos (θ) (2-9) Q = Vm Im sin (θ) (2-10) The cosine of the phase angle, θ between the voltage and the current is called power factor, The apparent power, S can be calculated from P and Q as S = Vm I m = P2 + Q2 (2-11) The apparent power is measured in volt-ampere (VA), kVA or MVA.

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Acoustical Measurements (rev.) by L. Beranek


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