ABB Industrial IT enabled REX 521 Technical Reference Manual, General page 54

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Technical Reference Manual, General
Relay Setting Tool...................................................................................... 10
Requirements................................................................................................ 9
Restoring factory settings........................................................................... 12
Revisions .................................................................................................... 49
REX 521 protection relay
Application area ..................................................................................... 8
General information ............................................................................... 7
Rogowski coil ....................................................................................... 15, 17
Rogowski coil values ................................................................................. 17
RS-232 interface......................................................................................... 32
RS-485 two-wire interface ......................................................................... 32
6
Safety information........................................................................................ 6
Scaling factors ............................................................................................ 15
Self-supervision.......................................................................................... 23
Functions .............................................................................................. 24
Self-supervision signal ............................................................................... 24
Sensor ............................................................................................... 8, 15, 37
Serial communication..................................................................... 26, 27, 39
Serial communication ports
Front panel optical PC connection ....................................................... 27
RS-485 connection ............................................................................... 27
Service pin............................................................................................ 27
Service........................................................................................................ 47
Service pin.................................................................................................. 27
Signal outputs............................................................................................. 37
Signalling output (SO) ............................................................................... 37
7
Temperature supervision ............................................................................ 15
Terminal connections ................................................................................. 45
Terminal diagrams
Basic ..................................................................................................... 41
High ...................................................................................................... 43
Medium ................................................................................................ 42
Sensor ................................................................................................... 44
Tests ........................................................................................................... 38
Time synchronization................................................................................. 32
Trip-circuit supervision ........................................................................ 21, 38
External resistor values ........................................................................ 22
External shunt resistance...................................................................... 22
9
Voltage divider values................................................................................ 17
Voltage transformer values ........................................................................ 16
1MRS 751108-MUM