ABB REX 521 Technical Reference Manual, General

60
1MRS 751108-MUM
Protection Relay
Technical Reference Manual, General
REX 521
R
Rated values ............................................................................................. 19
Real-time clock ........................................................................................ 17
Rear port options ...................................................................................... 32
Relay parameters ...................................................................................... 71
Relay Setting Tool .................................................................................... 14
Requirements ............................................................................................ 13
Restoring factory settings ......................................................................... 16
Revisions .................................................................................................. 58
REX 521 protection relay
Application area ................................................................................. 10
General information ............................................................................. 9
Rogowski coil ..................................................................................... 19, 21
Rogowski coil values ............................................................................... 21
RS-232 interface ....................................................................................... 38
RS-485 two-wire interface ....................................................................... 38
S
Scaling factors .......................................................................................... 19
Self-supervision ........................................................................................ 28
Functions ............................................................................................ 29
Self-supervision signal ............................................................................. 29
Sensor ........................................................................................... 12, 19, 44
Serial communication ................................................................... 31, 33, 46
Serial communication ports
Front panel optical PC connection ..................................................... 33
RS-485 connection ............................................................................. 32
Service pin .......................................................................................... 33
Service ...................................................................................................... 56
Service pin ................................................................................................ 33
Signal outputs ........................................................................................... 44
Signalling output (SO) ............................................................................. 44

ABB REX 521 Specifications

General

Brand	ABB
Model	REX 521
Category	Other
Language	English