CHAPTER 1: AC POWER MEASUREMENT
4
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
⋅
ω
DISTORTED WAVEFORM
:
L
+
t)
•
sin(
•
A
+
t)
•
sin(
•
A
+
t)
•
sin(
•
A
+
t)
•
sin(
•
A
3
3
2
2
1
1
ω
ω
ω
ω
TOTAL HARMONIC DISTORTION (THD)
:
100
Signal
l
Fundamenta
the
of
RMS
Signal
Distortion
Harmonic
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 monitors the harmonic distortion to the 31st harmonic. A waveform capture of distorted
waveform is also available.
% THD GRAPH
Summary of Contents for EPM 5300
Page 2: ......
Page 30: ...CHAPTER 4 COMMUNICATION INSTALLATION 26 EPM 5000 series Advanced Power Meters GE Multilin...
Page 70: ...CHAPTER 10 PROGRAMMING GROUP 1 66 EPM 5000 series Advanced Power Meters GE Multilin...
Page 88: ...CHAPTER 14 EXITING PROGRAMMING MODE 84 EPM 5000 series Advanced Power Meters GE Multilin...
Page 94: ...CHAPTER 15 PROGRAMMING QUICK REFERENCE 90 EPM 5000 series Advanced Power Meters GE Multilin...
