ABB REX 521 - 119

1MRS751802-MUM
REX 521
119
Protection Relay
Technical Reference Manual, Standard Configurations
DREC digital inputs:
(Trip 1, Trip 2, and Trip 3 are the Output SWGRP signals.)
1
H01 not available with transformers.
2
H08/H09 not available with sensors.
7.3.5. 3U
The measurement function block 3U measures true RMS phase-to-earth or phase-to-
phase voltages. If voltage dividers are used, as in configurations H01S-H07S, only
phase-to-earth voltages can be measured. If voltage transformers are used, as in
configurations H02-H07, only phase-to-phase voltages can be measured. As an
exception from these, in configuration H08, voltage transformers are used and
phase-to-earth voltage is measured. The voltage values are updated once per
fundamental frequency cycle, that is, the integration time for true RMS calculation
is one fundamental cycle.
Fig. 7.3.5.-1 Function block symbol of 3U
Input B01/B02 M01/M02
H01
1
H02 H03 H04
H05/H08
2
H06 H07
H09
2
BI1
Start 3I> Start 3I> Start 3I>-> Start 3I>-> Start 3I> Start 3I> Start 3I> Start 3I> Start 3I> Start 3I>
BI2
Start 3I>> Start 3I>> Start 3I>>-> Start 3I>>-> Start 3I>> Start 3I>> Start 3I>> Start 3I>> Start 3I>> Start 3I>>
BI3
Start 3I>>> Start 3I>>> Start 3I>>> Start 3I> Start 3I>>> Start 3I>>> Start 3I>>> Start 3U> Start 3I>>> Start 3I>>>
BI4
Start Io> Start Io>-> Start Io>-> Start 3I>> Start Io>-> Start Io>-> Start Io> Start 3U>> Start Io>-> Start Io>
BI5
Start Io>> Start Io>>-> Start Io>>-> Start Io>-> Start Io>>-> Start Io>>-> Start Io>> Start 3U< Start Io>>-> Start Io>>
BI6
Start Io>>> Start Io>>>-> Start Io>>>-> Start Io>>-> Start Io>>>-> Start Io>>>-> Start Io>>> Start 3U<< Start Io> Start Io>>>
BI7
Start Iub> Start Iub> Start Iub> Start Io>>>-> Start Iub> Start Io> Start 3U> Start Uo> Start Io>> Start 3U>
BI8
Start 3Ith> Start 3Ith> Start 3Ith> Start Iub> Start 3Ith> Start Io>> Start 3U>> Start Uo>> Start 3Ithdev> Start 3U>>
BI9
Trip 3I> Trip 3I> Trip 3I>-> Start 3Ith> Trip 3I> Start Io>>> Start 3U< Start Uo>>> Start I2>/I2>> Start 3U<
BI10
Trip 3I>> Trip 3I>> Trip 3I>>-> Start1 f1 Trip 3I>> Start Iub> Start 3U<< Start 1 f1 Start Is2t n< Start 3U<<
BI11
Trip 3I>>> Trip 3I>>> Trip 3I>>> Start2 f1 Trip 3I>>> Start 3Ith> Start Uo> Start 2 f1 Start 3I< Start Uo>
BI12
Trip Io> Trip Io>-> Trip Io>-> Trip1 Trip Io>-> Start 3I>-> Start Uo>> Start 1 f2 Start 3U>/3U>> Start Uo>>
BI13
Trip Io>> Trip Io>>-> Trip Io>>-> Trip2 Trip Io>>-> Start1 f1 Start Uo>>> Start 2 f2 Start 3U</3U<< Start Uo>>>
BI14
Trip Io>>> Trip Io>>>-> Trip Io>>>-> Trip3 Trip Io>>>-> Start2 f1 Trip 1 Trip 1 Start1/Start2 f1 Start1/Start2 f1
BI15
Trip Iub> Trip Iub> Trip Iub> - Trip Iub> Trip1 Trip 2 Trip 2 Trip1 Start1/Start2 f2
BI16
Trip 3Ith> Trip 3Ith> Trip 3Ith> - Trip 3Ith> Trip2 Trip 3 Trip 3 Trip2 Trip1
3U
UL1_U12
UL2_U23
UL3_U31
MEVO3A