ABB REU 523 - Abbreviations

1MRS 750942-MUM
Combined Overvoltage and Undervoltage Relay
Technical Reference Manual
REU 523
59
8. Abbreviations
BI Binary input
CBFP Circuit-breaker failure protection
CPU Central processing unit
IDMT Inverse definite minimum time characteristic
IEC_103 Standard IEC 60870-5-103
IRF Internal relay fault
LCD Liquid Crystal Display
LED Light-emitting diode
LSG
LON

/SPA Gateway, SPA-ZC 102
HMI Human-Machine Interface
PCB Printed Circuit Board
PO1, PO2 Power outputs
SGB Switchgroup for binary input
SGF Switchgroups for functions
SGR Switchgroups for output contacts
SO1, SO2 Signal outputs
U
12
, U
23
, U
31
Phase-to-phase voltages
U
1s
Positive-phase-sequence voltage