ABB Industrial IT enabled REX 521 - Page 54

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Technical Reference Manual, General
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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