10.2.9 Technical revision history
Table 709: VMHAI Technical revision history
Technical revision Change
B Internal improvement.
C Internal improvement.
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 PHQVVR PQMU PQMV
10.3.2 Function block
Figure 359: Function block
10.3.3 Functionality
The voltage variation 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.
PHQVVR contains a blocking functionality. It is possible to block a set of function
outputs or the function itself, if desired.
Power quality measurement functions
1MRS758755 C
708 REC615 & RER615
Technical Manual
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