Bender B 9310 0735, Manual

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Power Quality
56 PEM735_D00084_00_M_XXEN/02.2015
7.3.7 Interharmonic Voltage
according to DIN EN 50160
An interharmonic voltage is a sinusoidal voltage with a frequency not equal to an inte-
ger multiple of the fundamental frequency (e. g.
f
n
= 50 Hz).
Interharmonic voltages at closely adjacent frequencies can appear at the same time
forming a wide band spectrum. The level of interharmonics is increasing due to the de-
velopment of frequency converters and similar control equipment. Levels are under
consideration, pending more experience.
In certain cases interharmonics, even at low levels, give rise to flicker, or cause interfer-
ence in ripple control systems.
Fig. 7.16: Interharmonic Voltage (subpage 1)