ABB REL 551-C1*2.5 Technical Reference Manual page 20

Protect line differential protection terminal
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Introduction to the technical reference manual
MVB
MVsubEna
NegSeqROA
NSANGLE
NUMSTEP
NX
OCO cycle
PCI
PCM
PISA
PLD
PMC
POTT
PPS
Process bus
PSM
PST
PT ratio
PUTT
R1A
R1B
RADSS
RASC
RCA
REVAL
RFPP
RFPE
RISC
RMS value
RS422
RS485
RS530
RTU
Multifunction vehicle bus. Standardized serial bus originally developed
for use in trains
Enable substitution
Operate angle for internal/external negative sequence fault discrimina-
tor.
Angle between local and remote negative sequence currents
Number of steps that shall be activated
Open-Close-Open cycle
Peripheral Component Interconnect
Pulse code modulation
Process interface for sensors & actuators
Programmable Logic Device
Permissive overreach transfer trip
Precise Positioning System
Bus or LAN used at the process level, that is, in near proximity to the
measured and/or controlled components
Power supply module
Parameter setting tool
Potential transformer or voltage transformer ratio
Permissive underreach transfer trip
Source resistance A (near end)
Source resistance B (far end)
Resource Allocation Decision Support System
Synchrocheck relay, from COMBIFLEX range.
Functionality characteristic angle
Evaluation software
Resistance of phase-to-phase faults
Resistance of phase-to-earth faults
Reduced instruction set computer
Root mean square value
A balanced serial interface for the transmission of digital data in
point-to-point connections
Serial link according to EIA standard RS485
A generic connector specification that can be used to support RS422,
V.35 and X.21 and others
Remote Terminal Unit
Chapter 1
Introduction
11

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