ABB ret650, Technical Manual

Page: 666 / 670

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.
SOF Status of fault
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 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.
TEF Time delayed earth-fault protection function
TLS Transport Layer Security
TM Transmit (disturbance data)
TNC connector Threaded Neill-Concelman, a threaded constant impedance
version of a BNC connector
TP Trip (recorded fault)
TPZ, TPY, TPX, TPS Current transformer class according to IEC
TRM Transformer Module. This module transforms currents and
voltages taken from the process into levels suitable for
further signal processing.
TYP Type identification
Section 22
1MRK 504 135-UEN A
Glossary
660
Technical manual