Name Type Values (Range) Unit Description
DMD_THD_B FLOAT32 0.00...500.00 % Demand value for THD
for phase B
3SMHTHD_C FLOAT32 0.00...500.00 % 3 second mean value of
THD for phase C
DMD_THD_C FLOAT32 0.00...500.00 % Demand value for THD
for phase C
10.3 Voltage variation PHQVVR
10.3.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Voltage variation detection function PHQVVR PQMU PQMV
10.3.2 Function block
GUID-9AA7CE99-C11C-4312-89B4-1C015476A165 V1 EN
Figure 412: Function block
10.3.3 Functionality
The voltage variation measurement function PHQVVR is used for measuring the
short-duration voltage variations in distribution networks.
Power quality in the voltage waveform is evaluated by measuring voltage swells,
dips and interruptions. PHQVVR includes single-phase and three-phase voltage
variation modes.
Typically, short-duration voltage variations are defined to last more than half of the
nominal frequency period and less than one minute. The maximum magnitude (in
the case of a voltage swell) or depth (in the case of a voltage dip or interruption)
and the duration of the variation can be obtained by measuring the RMS value of
the voltage for each phase. International standard 61000-4-30 defines the voltage
variation to be implemented using the RMS value of the voltage. IEEE standard
1159-1995 provides recommendations for monitoring the electric power quality of
the single-phase and polyphase ac power systems.
Section 10 1YHT530004D05 D
Power quality measurement functions
772 615 series
Technical Manual
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