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Section 5
Glossary
56
IRIG-B:
ITU
LAN
LIB 520
LCD
LDCM
LDD
LED
LNT
LON
MCB
MCM
MIM
MPM
MVAL
MVB
NCC
NOF
NUM
OCO cycle
OCP
OEM
OLTC
OTEV
OV
Overreach
InterRange Instrumentation Group Time code format B,
standard 200
International Telecommunications Union
Local area network
High-voltage software module
Liquid crystal display
Line data communication module
Local detection device
Light-emitting diode
LON network tool
Local operating network
Miniature circuit breaker
Mezzanine carrier module
Milli-ampere module
Main processing module
Value of measurement
Multifunction vehicle bus. Standardized serial bus originally
developed for use in trains.
National Control Centre
Number of grid faults
Numerical module
Open-close-open cycle
Overcurrent protection
Optical Ethernet module
On-load tap changer
Disturbance data recording initiated by other event than start/
pick-up
Overvoltage
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.
1MRK 511 391-UUS A
670 series 2.2 ANSI
Communication protocol manual
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