9424200996 40-1
BE1-11m Power Quality
40 • Power Quality
The BE1-11m offers class B power quality measurement performance as defined by IEC 610004-30.
Power quality data consists of voltage, distortion, dips/swells, and harmonics. Power quality is reported
through BESTCOMSPlus®, the front-panel interface, and the web page interface. Refer to the
BESTnet™Plus chapter for information on viewing the demands through the web page interface.
Operation
A dip event begins when any one phase decreases below the dip threshold and ends when all phases
return above the dip threshold and dip hysteresis. A swell event begins when any one phase increases
above the swell threshold and ends when all phases return below the swell threshold and swell
hysteresis. A dip event reports dip duration and the residual voltage measured during the dip event. A
swell event reports swell duration and the maximum voltage measured during the swell event. It is
possible for a dip or swell event to begin on one phase and end on another. It is also possible for a dip
and a swell to occur at the same time on different phases.
Reference Mode
In Sliding mode, dip and swell thresholds are calculated based on the sliding average voltage, which
changes over time. In Fixed mode, dip and swell thresholds are calculated based on the system rated
voltage.
Dip Hysteresis
This setting determines the hysteresis of the dip threshold. For example, a value of 1.02 sets the
hysteresis to 2% of the dip threshold.
Dip Ratio
This setting determines the dip threshold. For example, a value of 0.90 sets the dip threshold to 90% of
the reference voltage.
Swell Hysteresis
This setting determines the hysteresis of the swell threshold. For example, a value of 0.98 sets the
hysteresis to 2% of the swell threshold.
Swell Ratio
This setting determines the swell threshold. For example, a value of 1.10 sets the swell threshold to 110%
of the reference voltage.
Settings
BESTCOMSPlus Navigation Path: Settings Explorer, Metering Configuration, Power Quality
HMI Navigation Path: Settings Explorer, Metering Configuration, Power Quality
Settings are made using BESTCOMSPlus. Use the Settings Explorer to open the Metering Configuration,
Power Quality tree branch. The Power Quality screen is illustrated in Figure 40-1.
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