LAN
Local area network
LIB 520
High-voltage software module
LCD
Liquid crystal display
LDD
Local detection device
LED
Light-emitting diode
MCB
Miniature circuit breaker
MCM
Mezzanine carrier module
MVB
Multifunction vehicle bus. Standardized serial bus originally
developed for use in trains.
NCC
National Control Centre
OCO cycle
Open-close-open cycle
OCP
Overcurrent protection
OLTC
On-load tap changer
OV
Over-voltage
Overreach
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.
PCI
Peripheral component interconnect, a local data bus
PCM
Pulse code modulation
PCM600
Protection and control IED manager
PC-MIP
Mezzanine card standard
PMC
PCI Mezzanine card
POR
Permissive overreach
POTT
Permissive overreach transfer trip
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 within PCM600
PT ratio
Potential transformer or voltage transformer ratio
PUTT
Permissive underreach transfer trip
RASC
Synchrocheck relay, COMBIFLEX
1MRK 506 331-UUS A
Section 9
Glossary
163
Commissioning Manual
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