ABB Relion 650 Series Commissioning Manual page 77

1MRK 505 264-UEN A
SMT
SMS
SNTP
SRY
ST
Starpoint
SVC
TC
TCS
TCP
TCP/IP
TNC connector
TPZ, TPY, TPX, TPS
UMT
Underreach
U/I-PISA
UTC
UV
WEI
VT
X.21
Busbar protection REB650
Commissioning manual
Signal matrix tool within PCM600
Station monitoring system
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.
Switch for CB ready condition
Switch or push button to trip
Neutral 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.
Threaded Neill-Concelman, a threaded constant impedance version of a
BNC connector
Current transformer class according to IEC
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.
Process interface components that deliver measured voltage and
current values
Coordinated Universal Time. A coordinated time scale, maintained by
the Bureau International des Poids et Mesures (BIPM), which forms the
basis of a coordinated dissemination of standard frequencies and time
signals. UTC is derived from International Atomic Time (TAI) by the
addition of a whole number of "leap seconds" to synchronize it with
Universal Time 1 (UT1), thus allowing for the eccentricity of the Earth's
orbit, the rotational axis tilt (23.5 degrees), but still showing the Earth's
irregular rotation, on which UT1 is based. The Coordinated Universal
Time is expressed using a 24-hour clock, and uses the Gregorian
calendar. It is used for aeroplane and ship navigation, where it is also
sometimes known by the military name, "Zulu time." "Zulu" in the
phonetic alphabet stands for "Z", which stands for longitude zero.
Undervoltage
Weak end infeed logic
Voltage transformer
A digital signalling interface primarily used for telecom equipment
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Section 10
Glossary
71