ABB Relion 650 Series Operation Manual page 99

1MRK 500 093-UUS A
RISC
RMS value
RS422
RS485
RTC
RTU
SA
SBO
SC
SCS
SCADA
SCT
SDU
SMA connector
SMT
SMS
SNTP
SRY
ST
Starpoint
SVC
TC
TCS
TCP
TCP/IP
TNC connector
TPZ, TPY, TPX, TPS
UMT
650 series
Operation manual
Resistance for phase-to-ground 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
Real-time clock
Remote terminal unit
Substation Automation
Select-before-operate
Switch or push button to close
Station control system
Supervision, control and data acquisition
System configuration tool according to standard IEC 61850
Service data unit
Subminiature version A, A threaded connector with constant impedance.
Signal matrix tool within PCM600
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 embedded
node can instead synchronize with a remote clock, providing the required
accuracy.
Switch for CB ready condition
Switch or push button to trip
Neutral/Wye point of transformer or generator
Static VAr compensation
Trip coil
Trip circuit supervision
Transmission control protocol. The most common transport layer protocol
used on Ethernet and the Internet.
Transmission control protocol over Internet Protocol. The de facto
standard Ethernet protocols incorporated into 4.2BSD Unix. TCP/IP was
developed by DARPA for Internet working and encompasses both network
layer and transport layer protocols. While TCP and IP specify two protocols
at specific protocol layers, TCP/IP is often used to refer to the entire US
Department of Defense protocol suite based upon these, including Telnet,
FTP, UDP and RDP.
Threaded Neill-Concelman, a threaded constant impedance version of a
BNC connector
Current transformer class according to IEC
User management tool
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Section 9
Glossary
93