SC Switch or push button to close
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
SELV circuit Safety Extra-Low Voltage circuit type according to IEC60255-27
SFP Small form-factor pluggable (abbreviation)
Optical Ethernet port (explanation)
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)
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.
Section 9 1MRK 500 131-UEN Rev. C
Glossary
64 Switchgear control unit SAM600-IO
Operation manual
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