ABB RELION Series, Technical Manual

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10.3.2 Function block
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Figure 360: 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.
10.3.4 Operation principle
The function can be enabled and disabled with the Operation setting. The
corresponding parameter values are "On" and "Off".
The operation of PHQVVR can be described with a module diagram. All the modules
in the diagram are explained in the next sections.
Section 10
1MRS758755 A
Power quality measurement functions
680 REC615 and RER615
Technical Manual