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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
PRP
Parallel redundancy protocol
PSM
Power supply module
PST
Parameter setting tool within PCM600
PTP
Precision time protocol
PT ratio
Potential transformer or voltage transformer ratio
PUTT
Permissive underreach transfer trip
RASC
Synchrocheck relay, COMBIFLEX
RCA
Relay characteristic angle
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
SCL
Short circuit location
SCS
Station control system
SCADA
Supervision, control and data acquisition
SCT
System configuration tool according to standard IEC 61850
SDU
Service data unit
SFP
Small form-factor pluggable (abbreviation)
Optical Ethernet port (explanation)
SLM
Serial communication module.
1MRK 511 408-UUS A
Section 27
Glossary
Phasor measurement unit RES670 2.2 ANSI
923
Technical manual
Summary of Contents for Relion RES670
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