Function Block - ABB RELION REX640 Technical Manual

1MRS759142 C
10.3.2
10.3.3
10.3.4
REX640
Technical Manual

Function block

GUID-697A52DA-1CBB-4592-95F4-13AA61B7CB70 V1 EN
Figure 835: Function block
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.
Analog channel configuration
PHQVVR has two analog group inputs which must be properly configured.
Table 1452: Analog inputs
Input
1)
I3P
U3P
1) Can be connected to GRPOFF
See the preprocessing function blocks in this document for the
possible signal sources. The GRPOFF signal is available in the
function block called Protection.
Power quality measurement functions
Description
Three-phase currents
Three-phase voltages
Section 10
1623