IP 54 Ingression protection, according to IEC standard, level 54
IRF Internal failure signal
IRIG-B: InterRange Instrumentation Group Time code format B,
standard 200
ITU International Telecommunications Union
LAN Local area network
LIB 520 High-voltage software module
LCD Liquid crystal display
LDCM Line differential communication module
LDD Local detection device
LED Light-emitting diode
LNT LON network tool
LON Local operating network
MCB Miniature circuit breaker
MCM Mezzanine carrier module
MIM Milli-ampere module
MPM Main processing module
MVB Multifunction vehicle bus. Standardized serial bus originally
developed for use in trains.
NCC National Control Centre
NUM Numerical module
OCO cycle Open-close-open cycle
OCP Overcurrent protection
OEM Optical ethernet module
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
1MRK 502 029-UEN A Section 19
Glossary
249
Installation and commissioning manual
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