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Users Manual
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Glossary
Unbalance (u2)
Supply Voltage Unbalance
Condition in a three phase system in which the RMS. values of the line-to-line voltages (fundamental component),
or the phase angles between consecutive line voltages, are not all equal. The unbalance value is the ratio of the
negative sequence to the positive sequence in percent and is typically in the range between 0% and 2%.
h01
Fundamental Frequency Component
RMS value of the fundamental frequency component of voltage or current.
Sub grouping according to IEC 61000-4-7 is applied.
h02 … h50
Harmonic Component
RMS value of the harmonic component of voltage or current.
Sub grouping according to IEC 61000-4-7 is applied.
THD
Total Harmonic Distortion
The ratio of the RMS value of the sum of all the voltage or current harmonic components h02 … h50 to the RMS
value of the fundamental component h01 of voltage or current.
THC
Total Harmonic Content
The RMS value of the sum of all the voltage or current harmonic components h02 … h50.
TDD
[1]
Total Demand Distortion
The ratio of the RMS value of the sum of all the current harmonic components h02 … h50 to I
L
, the maximum
demand current.
I
L
[1]
Maximum Demand Load Current
The current value is established at the point of common coupling and should be taken as the sum of the currents
corresponding to the maximum demand during each of the twelve previous months divided by 12.
This value is required to calculate TDD and to determine the applicable current harmonic limits defined by IEEE
519. It is a user input in measurement configuration.
I
SC
[1]
Maximum Short Circuit Current at Point of Common Coupling
This value is required to determine the applicable current harmonic limits defined by IEEE 519. It is a user input in
measurement configuration.
[1] Requires IEEE 519/Report License.
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