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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.
Содержание RELION REL670
Страница 8: ...Contents ...
Страница 54: ...46 Checking the optical connections Chapter 6 Checking the external optical and electrical connections ...
Страница 72: ...64 About this chapter Chapter 9 Establishing connection and verifying the LON communication ...
Страница 78: ...70 Downloading settings and configuration from a PC Chapter 10 Configuring the IED and changing settings ...
Страница 174: ...166 Remote communication Chapter 11 Verifying settings by secondary injection ...
Страница 190: ...182 Maintenance Chapter 13 Fault tracing and repair ...
Страница 198: ...190 Glossary Chapter 14 Glossary ...