SCL
Short circuit location
SCS
Station control system
SCADA
Supervision, control and data acquisition
SCT
System configuration tool according to standard IEC 61850
SDU
Service data unit
SLM
Serial communication module.
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 (SPA), a serial master/
slave protocol for point-to-point and ring 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)
1MRK502053-UEN B
Section 16
Glossary
Generator protection REG670 2.0 IEC
259
Commissioning manual
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