GE EPM 5350, EPM 5200, EPM 5300 instruction manual Waveform and Harmonics, Thd Graph

Models: EPM 5300 EPM 5200 EPM 5350

1 100
Download 100 pages 46.61 Kb
Page 8
Image 8
1.4: Waveform and Harmonics

CHAPTER 1: AC POWER MEASUREMENT

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: A • sin (ω ⋅ t)

DISTORTED WAVEFORM: A • sin(ω • t) + A1 • sin(ω1 • t) + A 2 • sin(ω2 • t) + A3 • sin(ω3 • t) + L

TOTAL HARMONIC DISTORTION (THD):

%of THD = RMS of Total Harmonic Distortion Signal100 RMS of the Fundamenta l Signal

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

4

EPM 5000 series Advanced Power Meters

GE Multilin

Page 8
Image 8
GE EPM 5350, EPM 5200, EPM 5300 instruction manual Waveform and Harmonics, Thd Graph