MI 2792 PowerQ4 Plus
Theory and internal operation
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5.2.8 Interharmonic voltage
The level of interharmonics is increasing due to the development 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 (see
5.2.10), or cause interference in ripple control systems.
5.2.9 Mains signalling on the supply voltage
In some countries the public distribution networks may be used by the public supplier for
the transmission of signals. Over 99 % of a day the 3 s mean of signal voltages shall be
less than or equal to the values given in the following figure.
Figure 5.14: Mains Signalling voltage level limits according to EN50160
5.2.10 Flicker severity
Under normal operating conditions, in any period of one week the long term flicker
severity caused by voltage fluctuation should be
P
lt
≤
1 for 95 % of the time.
5.2.11 PowerQ4 Plus recorder setting for EN 50160 survey
PowerQ4 Plus is able to perform EN 50160 surveys on all values described in previous
sections. In order to simplify procedure, PowerQ4 Plus has predefined recorder
configuration (EN510160) for it. By default all current parameters (RMS, THD, etc.) are
also included in survey, which can provide additional survey informations. Additionally,
during voltage quality survey user can simultaneously record other parameters too,
such as power, energy and current harmonics.
In order to collect voltage events during recording, Include voltage events option in
recorder should be enabled. See section 3.16.2 for voltage events settings.
