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Section 14
Glossary
192
SPA
SRY
ST
Starpoint
SVC
TC
TCS
TCP
TCP/IP
TEF
TLS
TM
TNC connector
TP
TPZ, TPY, TPX, TPS Current transformer class according to IEC
TRM
TYP
UMT
Underreach
Strömberg Protection Acquisition (SPA), a serial master/slave
protocol for point-to-point and ring communication.
Switch for CB ready condition
Switch or push button to trip
Neutral/Wye point of transformer or generator
Static VAr compensation
Trip coil
Trip circuit supervision
Transmission control protocol. The most common transport
layer protocol used on Ethernet and the Internet.
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.
Time delayed gound-fault protection function
Transport Layer Security
Transmit (disturbance data)
Threaded Neill-Concelman, a threaded constant impedance
version of a BNC connector
Trip (recorded fault)
Transformer Module. This module transforms currents and
voltages taken from the process into levels suitable for further
signal processing.
Type identification
User management tool
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 511 366-UUS -
Commissioning manual
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