Technical data

1MRS751108-MUM
REX 521
79
Protection Relay
Technical Reference Manual, General
13. Abbreviations
ASCII American Standard Code for Information Interchange
CRC Cyclic redundancy check
CT Current transformer
DI Digital input
HMI Human-machine interface
HSPO High-speed power output
IRF Internal relay fault
LCD Liquid crystal display
MMI Man-machine interface
NC Normally closed
NO Normally open
PO Power output
RS Rogowski sensor
RTC Real-time clock
RTU Remote terminal unit
SA Substation automation
SO Signalling output
TCS Trip-circuit supervision
VD Voltage divider
VT Voltage transformer