Abbreviations - ABB REU 523 Technical Reference Manual

1MRS 750942-MUM
8.
Combined Overvoltage and Undervoltage Relay
Technical Reference Manual

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
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 , U , U Phase-to-phase voltages
12 23 31
U Positive-phase-sequence voltage
1s
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/SPA Gateway, SPA-ZC 102
REU 523
59