GE EPM 5300 User Manual download pdf (Page 8)

CHAPTER 1: AC POWER MEASUREMENT

EPM 5000 series Advanced Power Meters GE Multilin

1.4: Waveform and Harmonics

Ideal power distribution has sinusoidal waveforms on voltages and currents. In real-life applications,

where inverters, computers, and motor controls are used, distorted waveforms are generated. These

distortions consist of harmonics of the fundamental frequency.

SINUSOIDAL WAVEFORM:

t)( sin •A

⋅

DISTORTED WAVEFORM:

L +t)•sin(•A+t)•sin(•A+t)•sin(•A+t) •sin( •A

332211

TOTAL HARMONIC DISTORTION (THD):

100

Signal lFundamenta the of RMS

Signal DistortionHarmonic Total of RMS

=THD of % ×

HARMONIC DISTORTION: A destructive force in power distribution systems. It creates safety problems,

shortens the life span of distribution transformers, and interferes with the operation of electronic devices.

The Futura+ monitors the harmonic distortion to the 31st harmonic. A waveform capture of distorted

waveform is also available.

% THD GRAPH

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 99 100

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GE EPM 5300 User Manual Page 8