ABB Relion 670 series Engineering Manual page 102

Section 10
Glossary
96
PC-MIP
PMC
POR
POTT
Process bus
PSM
PST
PT ratio
PUTT
RASC
RCA
RFPP
RFPE
RISC
RMS value
RS422
RS485
RTC
RTU
SA
SBO
SC
SCS
SCADA
SCT
SDU
SLM
SMA connector
SMT
SMS
SNTP
Mezzanine card standard
PCI Mezzanine card
Permissive overreach
Permissive overreach transfer trip
Bus or LAN used at the process level, that is, in near
proximity to the measured and/or controlled components
Power supply module
Parameter setting tool within PCM600
Potential transformer or voltage transformer ratio
Permissive underreach transfer trip
Synchrocheck relay, COMBIFLEX
Relay characteristic angle
Resistance for phase-to-phase faults
Resistance for phase-to-earth faults
Reduced instruction set computer
Root mean square value
A balanced serial interface for the transmission of digital
data in point-to-point connections
Serial link according to EIA standard RS485
Real-time clock
Remote terminal unit
Substation Automation
Select-before-operate
Switch or push button to close
Station control system
Supervision, control and data acquisition
System configuration tool according to standard IEC 61850
Service data unit
Serial communication module. Used for SPA/LON/IEC/
DNP3 communication.
Subminiature version A, A threaded connector with
constant impedance.
Signal matrix tool within PCM600
Station monitoring system
Simple network time protocol – is used to synchronize
computer clocks on local area networks. This reduces the
1MRK511240-UEN B
670 series
Engineering Manual