Technical data

1MRS751108-MUM
REX 521
83
Protection Relay
Technical Reference Manual, General
R
Rated values .............................................................................................. 24
Real-time clock ......................................................................................... 22
Rear port options ...................................................................................... 37
Relay parameters ...................................................................................... 73
Relay Setting Tool .................................................................................... 19
Requirements ............................................................................................ 17
Restoring factory settings ......................................................................... 21
Revisions .................................................................................................. 63
REX 521 protection relay
Application area .................................................................................. 14
General information ............................................................................ 13
Rogowski coil ..................................................................................... 24, 26
Rogowski coil values ................................................................................25
RS-232 interface ....................................................................................... 41
RS-485 two-wire interface .......................................................................41
S
Scaling factors .......................................................................................... 24
Self-supervision ........................................................................................ 33
Functions ............................................................................................ 33
Self-supervision signal ............................................................................. 34
Sensor ........................................................................................... 16, 24, 48
Serial communication ................................................................... 36, 37, 50
Serial communication ports
Front panel optical PC connection .....................................................37
RS-485 connection ............................................................................. 37
Service ...................................................................................................... 59
Service pin ................................................................................................ 37
Signal outputs ........................................................................................... 48
T
Temperature supervision .......................................................................... 23
Terminal connections ...............................................................................57
Terminal diagrams
Basic ................................................................................................... 52
High .................................................................................................... 54
High, Configuration H08, H09 ........................................................... 55
Medium ...............................................................................................53
Sensor ................................................................................................. 56
Tests .......................................................................................................... 49
Time synchronization ............................................................................... 44
Trip-circuit supervision ...................................................................... 31, 49
External resistor values ....................................................................... 32
External shunt resistance ....................................................................31