ABB REQ650 1.3 IEC, Commissioning Manual

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SCT System configuration tool according to standard IEC 61850
SDU Service data unit
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
UMT User management tool
Underreach A term used to describe how the relay behaves during a fault condition.
For example, a distance relay is underreaching when the impedance
presented to it is greater than the apparent impedance to the fault
applied to the balance point, that is, the set reach. The relay does not
“see” the fault but perhaps it should have seen it. See also Overreach.
1MRK 505 293-UEN B Section 10
Glossary
Breaker protection REQ650 115
Commissioning manual
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