ABB Relion 670 series Engineering Manual page 101

1MRK511240-UEN B
670 series
Engineering Manual
IP 40
IP 54
IRF
IRIG-B:
ITU
LAN
LIB 520
LCD
LDCM
LDD
LED
LNT
LON
MCB
MCM
MIM
MPM
MVB
NCC
NUM
OCO cycle
OCP
OEM
OLTC
OV
Overreach
PCI
PCM
PCM600
Ingression protection, according to IEC standard, level 40
Ingression protection, according to IEC standard, level 54
Internal failure signal
InterRange Instrumentation Group Time code format B,
standard 200
International Telecommunications Union
Local area network
High-voltage software module
Liquid crystal display
Line differential 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
Multifunction vehicle bus. Standardized serial bus
originally developed for use in trains.
National Control Centre
Numerical module
Open-close-open cycle
Overcurrent protection
Optical ethernet module
On-load tap changer
Over-voltage
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.
Peripheral component interconnect, a local data bus
Pulse code modulation
Protection and control IED manager
Section 10
Glossary
95