11
Introduction to the technical reference manual
Chapter 1
Introduction
MVB
Multifunction vehicle bus. Standardized serial bus originally developed
for use in trains
MVsubEna
Enable substitution
NegSeqROA
Operate angle for internal/external negative sequence fault discrimina-
tor.
NSANGLE
Angle between local and remote negative sequence currents
NUMSTEP
Number of steps that shall be activated
NX
OCO cycle
Open-Close-Open cycle
PCI
Peripheral Component Interconnect
PCM
Pulse code modulation
PISA
Process interface for sensors & actuators
PLD
Programmable Logic Device
PMC
POTT
Permissive overreach transfer trip
PPS
Precise Positioning System
Process bus
Bus or LAN used at the process level, that is, in near proximity to the
measured and/or controlled components
PSM
Power supply module
PST
Parameter setting tool
PT ratio
Potential transformer or voltage transformer ratio
PUTT
Permissive underreach transfer trip
R1A
Source resistance A (near end)
R1B
Source resistance B (far end)
RADSS
Resource Allocation Decision Support System
RASC
Synchrocheck relay, from COMBIFLEX range.
RCA
Functionality characteristic angle
REVAL
Evaluation software
RFPP
Resistance of phase-to-phase faults
RFPE
Resistance of phase-to-earth faults
RISC
Reduced instruction set computer
RMS value
Root mean square value
RS422
A balanced serial interface for the transmission of digital data in
point-to-point connections
RS485
Serial link according to EIA standard RS485
RS530
A generic connector specification that can be used to support RS422,
V.35 and X.21 and others
RTU
Remote Terminal Unit
Summary of Contents for REL 551-C1*2.5
Page 1: ...Technical reference manual ProtectIT Line differential protection terminal REL 551 C1 2 5 ...
Page 23: ...14 Introduction to the technical reference manual Chapter 1 Introduction ...
Page 39: ...30 Technical data Chapter 2 General ...
Page 63: ...54 Blocking of signals during test BST Chapter 3 Common functions ...
Page 71: ...62 Line differential protection phase segregated DIFL Chapter 4 Line differential protection ...
Page 89: ...80 Thermal phase overload protection THOL Chapter 5 Current ...
Page 101: ...92 Event function EV Chapter 7 Logic ...
Page 163: ...154 Terminal diagrams Chapter 11 Diagrams Figure 39 REL 551 C1 with DC switch ...