PCM600 Protection and control IED manager
PC-MIP Mezzanine card standard
PMC PCI Mezzanine card
POR Permissive overreach
POTT Permissive overreach transfer trip
Process bus Bus or LAN used at the process level, that is, in near
proximity to the measured and/or controlled components
PSM Power supply module
PST Parameter setting tool within PCM600
PT ratio Potential transformer or voltage transformer ratio
PUTT Permissive underreach transfer trip
RASC Synchrocheck relay, COMBIFLEX
RCA Relay characteristic angle
RFPP Resistance for phase-to-phase faults
RFPE Resistance for phase-to-earth faults
RISC Reduced instruction set computer
RMS value Root mean square value
RS422 A balanced serial interface for the transmission of digital
data in point-to-point connections
RS485 Serial link according to EIA standard RS485
RTC Real-time clock
RTU Remote terminal unit
SA Substation Automation
SBO Select-before-operate
SC Switch or push button to close
SCS Station control system
SCADA Supervision, control and data acquisition
SCT System configuration tool according to standard IEC 61850
SDU Service data unit
SLM Serial communication module. Used for SPA/LON/IEC/
DNP3 communication.
SMA connector Subminiature version A, A threaded connector with
constant impedance.
SMT Signal matrix tool within PCM600
SMS Station monitoring system
Section 15 1MRK504114-UEN E
Glossary
118
Operator's manual
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