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Table 8.2 Harmonic Analysis Functionality
Harmonic data
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 to 41
Harmonic magnitude, harmonics 1 to 41
Harmonic distortion, harmonics 42 to 63
Harmonic magnitude, harmonics 42 to 63
Allen-Bradley HMIs
DM
M4
M6
M8
(Avg.)
M5
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
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:
∞
Σ
) 2
(
H
n
n
=
2
------------------------ -
THD
=
H
1
The standard IEC definition of harmonic distortion is the "Distortion
Index (DIN)" and is computed for each channel as follows:
∞
Σ
) 2
(
H
n
n
=
2
-------------------- -
∞
Σ
DIN
=
) 2
(
H
n
n
=
1
Per
Per
current
voltage
channel
channel
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Where:
• H
= magnitude of the n
n
(n ≤ 41 or 63)
• H
= magnitude of fundamental
1
Where:
• H
= magnitude of the n
n
(n ≤ 41 or 63)
• DIN is equivalent to IEC THD
Publication 1404-UM001D-EN-E - October 2004
Advanced Features
8-7
Avg. of
Avg. of
current
voltage
channels
channels
•
•
•
•
•
•
•
•
•
•
th
harmonic
th
harmonic
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