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Introduction to the technical reference manual
U/I-PISA
UNom
UPS
UTC
V.36
VDC
WEI
VT
VTSZ
X1A
X1B
X1L
X.21
XLeak
XOL
ZCOM-CACC
ZCOM-CR
ZCOM-TRIP
ZCOM-LCG
Process interface components that delivers measured voltage and cur-
rent values
Nominal voltage in % of UBase for voltage based timer
Measured signal magnitude (voltage protection)
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
Same as RS449. A generic connector specification that can be used to
support RS422 and others
Volts Direct Current
Week-end infeed logic
Voltage transformer
Block of trip from weak-end infeed logic by an open breaker
Source reactance A (near end)
Source reactance B (far end)
Positive sequence line reactance
A digital signalling interface primarily used for telecom equipment
Winding reactance in primary ohms
Zero sequence line reactance
Forward overreaching zone used in the communication scheme
Carrier Receive Signal
Trip from the communication scheme
Alarm Signal LIne-check Guard
Chapter 1
Introduction
13
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