in the European standard EN 50160. However, the power quality standards like the
international standard IEC 61000-4-30 specify that the voltage variation event is
characterized by its duration and magnitude. Furthermore, IEEE Std 1159-1995 gives
the recommended practice for monitoring the electric power quality.
Voltage variation measurement can be done to the phase-to-earth and phase-
to-phase voltages. The power quality standards do not specify whether the
measurement should be done to phase or phase-to-phase voltages. However, in
some cases it is preferable to use phase-to-earth voltages for measurement. The
measurement mode is always TRMS.
10.3.8 Signals
10.3.8.1 PHQVVR Input signals
Table 1634: PHQVVR Input signals
Name Type Default Description
I3P SIGNAL - Three-phase currents
U3P SIGNAL - Three-phase voltages
BLOCK BOOLEAN 0=False Block signal for acti-
vating the blocking
mode
10.3.8.2 PHQVVR Output signals
Table 1635: PHQVVR Output signals
Name Type Description
OPERATE BOOLEAN Voltage variation detected
START BOOLEAN Voltage variation present
SWELLST BOOLEAN Voltage swell active
DIPST BOOLEAN Voltage dip active
INTST BOOLEAN Voltage interruption active
10.3.9 PHQVVR Settings
Table 1636: PHQVVR Group settings (Basic)
Parameter Values (Range) Unit Step Default Description
Reference voltage 10.0...200.0 %Un 0.1 57.7 Reference supply
voltage in %
Voltage dip set 1 10.0...100.0 % 0.1 80.0 Dip limit 1 in % of
reference voltage
VVa dip time 1 0.5...54.0 cycles 0.1 3.0 Voltage variation
dip duration 1
Table continues on the next page
1MRS759142 F Power quality measurement functions
REX640
Technical Manual
1843
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