User Manual, Firmware rev. 3.0 or LATER Owner's manual

166 Publication 1404-UM001F-EN-P - November 2009
Chapter 8 Advanced Features
Harmonic Analysis
The power monitor provides harmonic data to help you understand
this important element of power quality in your facility. Each model
provides a different level of harmonic information.
The Harmonic Analysis Functionality
table provides an overview of
the harmonic analysis available in each model. You may access all
harmonic data by using communication. The display module can
access average values of the parameters as indicated in the DM
column.
IEEE THD and DIN
Both of these total harmonic distortion calculation methods provide a
summary indication of the amount of distortion due to harmonics
present in a system. The standard IEEE definition of harmonic
distortion is Total Harmonic Distortion (THD) and is computed for
each channel as follows:
Harmonic Analysis Functionality
Harmonic data DM
(Avg.)
M4
M5
M6 M8 Per
Current
Channel
Per
Voltage
Channel
Avg. Of
Current
Channels
Avg. Of
Voltage
Channels
IEEE Total Harmonic Distortion (THD) • •••• • • •
IEC Distortion Index (DIN) • •••• • • •
Crest Factor • •••• • • •
Telephone Interference Factor (TIF) ••• • • •
K-factor ••• • • •
IEEE-519 Total Demand Distortion (TDD) •••
IEEE 519 Pass / Fail ••• •
Harmonic distortion, harmonics 1
…41
••• •
Harmonic magnitude, harmonics 1
…41
••• •
Harmonic distortion, harmonics 42
…63
•• •
Harmonic magnitude, harmonics 42
…63
•• •
THD
∞
Σ
n 2=
H
n
()
2
H
1
-------------------------=
W
h
ere:
• H
n
= magnitude of the n
th
harmonic
(n ≤ 41 or 63)
• H
1
= magnitude of fundamental