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Device Functions
2.3 Measurement and Evaluation Functions
[dw_ac_power, 1, en_US]
Figure 2-25
Harmonics, Interharmonics, Direction Harmonics
2.3.2
2.3.2.1
Function Description
Harmonic Power and Harmonic Angles
Measurement of phase angles is helpful to analyze different phenomena. It can be used for the following
purposes:
•
Evaluation of harmonic flows throughout the system
•
Identification of harmonic sources and harmonic sinks
•
Calculation of active, reactive, and apparent powers of harmonics
•
Assessment of harmonic current measurements in different points in the system
•
Modeling of disturbing loads and evaluation of their disturbing effect
•
Identification of measures to reduce the circuit feedback of the load
The device provides these measurements to support evaluation options that support the customer in mini-
mizing the influence of harmonics in the network or load, for example, when selecting the devices to reduce
the circuit feedback, filters, and reactive compensation.
Harmonic Directions
The device measures harmonics of voltages, currents, and powers up to the 63rd order according to the
IEC 61000-4-7 standard.
The following values are given for each harmonic:
•
RMS value (for power: RMS value and sign)
•
Phase angle
The sign of the active power of the single harmonic can indicate the direction of the power flow of this
harmonic in a supply system – seen from the installation point of the device. Thus, it is possible to identify
demands that generate the harmonics and that are probably the cause of the harmonics.
For the voltage and current, the given phase angle of the harmonic refers to the voltage of the fundamental
component in the respective phase. The phase angle between the current harmonic and the corresponding
voltage harmonic is used to calculate the sign of the active harmonic power.
64
Submenu Various Measured Quantities
SICAM, SICAM Q100 7KG95xx, Manual
E50417-H1040-C522-A8, Edition 09.2020
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