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Glossary Chapter 14
Glossary
RASC Synchrocheck relay, COMBIFLEX
RCA Relay characteristic angle
REVAL Evaluation software
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
RS530 A generic connector specification that can be used to support RS422,
V.35 and X.21 and others.
RTU Remote terminal unit
SA Substation Automation
SC Switch or push-button to close
SCS Station control system
SCT System Configuration Tool according to standard IEC 61850
SLM Serial communication module. Used for SPA/LON/IEC communication.
SMA connector Subminiature version A, A threaded connector with constant impedance.
SMS Station monitoring system
SNTP 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.
SPA Strömberg Protection Acquisition, a serial master/slave protocol for
point-to-point communication
SRY Switch for CB ready condition
ST Switch or push-button to trip
Starpoint Neutral point of transformer of generator
SVC Static VAr compensation
TC Trip coil
TCS Trip circuit supervision
TCP Transmission Control Protocol. The most common transport layer proto-
col used on Ethernet and the Internet.
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