ABB Relion 650 Series Operation Manual page 98

Section 9
Glossary
IRF
IRIG-B:
ITU
LAN
LIB 520
LCD
LDD
LED
MCB
MCM
MVB
NCC
OCO cycle
OCP
OLTC
OV
Overreach
PCI
PCM
PCM600
PC-MIP
PISA
PMC
POR
POTT
Process bus
PSM
PST
PT ratio
PUTT
RASC
RCA
RFPP
92
Internal failure signal
InterRange Instrumentation Group Time code format B, standard 200
International Telecommunications Union
Local area network
High-voltage software module
Liquid crystal display
Local detection device
Light-emitting diode
Miniature circuit breaker
Mezzanine carrier module
Multifunction vehicle bus. Standardized serial bus originally developed for
use in trains.
National Control Centre
Open-close-open cycle
Overcurrent protection
On-load tap changer
Over-voltage
A term used to describe how the relay behaves during a fault condition. For
example, a distance relay is overreaching when the impedance presented
to it is smaller than the apparent impedance to the fault applied to the
balance point, that is, the set reach. The relay "sees" the fault but perhaps
it should not have seen it.
Peripheral component interconnect, a local data bus
Pulse code modulation
Protection and control IED manager
Mezzanine card standard
Process interface for sensors & actuators
PCI Mezzanine card
Permissive overreach
Permissive overreach transfer trip
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 within PCM600
Potential transformer or voltage transformer ratio
Permissive underreach transfer trip
Synchrocheck relay, COMBIFLEX
Relay characteristic angle
Resistance for phase-to-phase faults
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1MRK 500 093-UUS A
650 series
Operation manual