ABB REX 521 - Uo>, Uo>> and Uo

1MRS751802-MUM
REX 521
101
Protection Relay
Technical Reference Manual, Standard Configurations
Fig. 7.1.10.-2 Input and output signal overview for the auto-reclose function
7.1.11. Uo>, Uo>> and Uo>>>
The residual overvoltage protection function blocks are designed for sensitive earth
fault protection whenever the DT characteristic is appropriate. Suppression of
harmonics is possible.
Fig. 7.1.11.-1 Function block symbol of Uo>, Uo>> and Uo>>>
O-->I
AR1
AR2
AR3
AR4
DEFTRIP
LOCKOUT
ROPEN
RCLOSE
SHOT1
SHOT2
SHOT3
SHOT4
SHOT5
AR1TRIP
AR2TRIP
AR3TRIP
AR4TRIP
CB FAIL
DEFTRIP
LOCKOUT
TRDUE
TDDUE
ACTIVE
SHOT_ALARM
D
I1...DI9
DI1...DI9
O->1 Active
O->1 Alarm 1
O->1 Alarm 2
O->I 3I> Start
O->I 3I>> Start
O->I 3I>>> Start
.
.
.
Ext. start
O->I Trip 3I>
O->I Trip 3I>>
O->I Trip 3I>>>
.
.
.
Ext. trip
ARINH
ARON
CBOPEN
CBCLOSE
RESET
SHOT1
SHOT2
SHOT3
SHOT4
SHOT5
TRDUE
TDDUE
ACTIVE
AR1TRIP
AR2TRIP
AR3TRIP
AR4TRIP
CBFAIL
DEFTRIP
LOCKOUT
SHOT_ALARM
AR1TRIP
AR2TRIP
AR3TRIP
AR4TRIP
CBFAIL
DEFTRIP
LOCKOUT
SHOT_ALARM
DI1...DI9
DI1...DI9
CB pos. open
CB pos. close
Reset
Autorclose
Input SWGRP
Output SWGRP
Initiation signals
Residual over voltage protection, low-set stage, Uo>, high-set stage, Uo>> and
instantaneous stage, Uo>>>
Start voltage 2.0...100.0% Un
Operate time 0.05...300.00 s
Operation mode Not in use
Definite time
Measuring mode Peak-to-peak
Fundam.freq.
Note! The values below apply when f/fn = 0.95...1.05
Operation accurcy ±2.5% of set value or ±0.01 x Un
BS1
BS2
GROUP
RESET
START
TRIP
Uo>
BS1
BS2
GROUP
RESET
START
TRI
P
Uo>>
BS1
BS2
GROUP
RESET
START
TRIP
Uo>>>