Hitachi Relion 670 Series Commissioning Manual page 281

1MRK506371-UUS Rev. M
Starpoint
SVC
TC
TCS
TCP
TCP/IP
TEF
TLS
TM
TNC connector
TP
TPZ, TPY, TPX, TPS
TRM
TYP
UMT
Underreach
UTC
UV
WEI
VT
X.21
3I
O
Line distance protection REL670
Commissioning manual
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)
Current transformer class according to IEC
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.
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
Three times zero-sequence current.Often referred to as the residual or the
ground-fault current
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Section 15
Glossary
275