ABB REL670 Installation And Commissioning Manual page 196

188
Glossary
RASC
RCA
REVAL
RFPP
RFPE
RISC
RMS value
RS422
RS485
RS530
RTU
SA
SC
SCS
SCT
SLM
SMA connector
SMS
SNTP
SPA
SRY
ST
Starpoint
SVC
TC
TCS
TCP
Synchrocheck relay, COMBIFLEX
Relay characteristic angle
Evaluation software
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
A generic connector specification that can be used to support RS422,
V.35 and X.21 and others.
Remote terminal unit
Substation Automation
Switch or push-button to close
Station control system
System Configuration Tool according to standard IEC 61850
Serial communication module. Used for SPA/LON/IEC communication.
Subminiature version A, A threaded connector with constant impedance.
Station monitoring system
Simple Network Time Protocol – is used to synchronize computer clocks
on local area networks. This reduces the requirement to have accurate
hardware clocks in every embedded system in a network. Each embed-
ded node can instead synchronize with a remote clock, providing the
required accuracy.
Strömberg Protection Acquisition, a serial master/slave protocol for
point-to-point communication
Switch for CB ready condition
Switch or push-button to trip
Neutral point of transformer of generator
Static VAr compensation
Trip coil
Trip circuit supervision
Transmission Control Protocol. The most common transport layer proto-
col used on Ethernet and the Internet.
Chapter 14
Glossary