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
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
PMC
PCI Mezzanine card
POR
Permissive overreach
Section 25
1MRK 511 365-UUS A
Glossary
876
Phasor measurement unit RES670 2.1 ANSI
Technical manual
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