RTC Real time clock
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
SMA connector Subminiature version A, A threaded connector with constant
impedance.
SMT Signal matrix tool within PCM600
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 embedded node can instead synchronize with a
remote clock, providing the required accuracy.
SRY Switch for CB ready condition
ST Switch or push-button to trip
Starpoint Neutral/Wye point of transformer or generator
SVC Static VAr compensation
TC Trip coil
TCS Trip circuit supervision
TCP Transmission control protocol. The most common transport
layer protocol used on Ethernet and the Internet.
TCP/IP 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.
TNC connector Threaded Neill Concelman, A threaded constant impedance
version of a BNC connector
TPZ, TPY, TPX,
TPS
Current transformer class according to IEC
Section 15 1MRK506276-UUS B
Glossary
110
Operator's manual
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