
Doc
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E154713
1-14
1: Three-Phase Power Measurement
Electro
Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
Electro
Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
In applications where the voltage and current are not distorted, the Total Power Factor
will equal the Displacement Power Factor. But if harmonic distortion is present, the
two power factors will not be equal.
1.4: Harmonic Distortion
Harmonic distortion is primarily the result of high concentrations of non-linear loads.
Devices such as computer power supplies, variable speed drives and fluorescent light
ballasts make current demands that do not match the sinusoidal waveform of AC elec-
tricity. As a result, the current waveform feeding these loads is periodic but not sinu-
soidal. Figure 1.10 shows a normal, sinusoidal current waveform. This example has
no distortion.
Figure 1.10: Nondistorted Current Waveform
Figure 1.11 shows a current waveform with a slight amount of harmonic distortion.
The waveform is still periodic and is fluctuating at the normal 60 Hz frequency.
However, the waveform is not a smooth sinusoidal form as seen in Figure 1.10.
Time
Amps
– 1000
– 500
0
500
1000
Summary of Contents for Shark 100T
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