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