ITU International Telecommunications Union
LAN Local area network
LIB 520 High-voltage software module
LCD Liquid crystal display
LDAPS Lightweight Directory Access Protocol
LDCM Line data 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
MVAL Value of measurement
MVB Multifunction vehicle bus. Standardized serial bus originally developed for use in
trains.
NCC National Control Centre
NOF Number of grid faults
NUM Numerical module
OCO cycle Open-close-open cycle
OCP Overcurrent protection
OEM Optical Ethernet module
OLTC On-load tap changer
OTEV Disturbance data recording initiated by other event than start/pick-up
OV Overvoltage
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
PELV circuit Protected Extra-Low Voltage circuit type according to IEC60255-27
PMC PCI Mezzanine card
POR Permissive overreach
POTT Permissive overreach transfer trip
1MRK 504 165-UUS Rev. J Section 16
Glossary
Transformer protection RET670 319
Commissioning manual
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