ABB REL670 Installation And Commissioning Manual page 195

Glossary
IP 40
IP 54
ITU
LAN
LIB 520
LCD
LDCM
LDD
LED
LNT
LON
MCB
MCM
MIM
MPM
MVB
NCC
NUM
OCO cycle
OLTC
OV
Overreach
PCI
PCM
PCM600
PISA
POTT
Process bus
PSM
PST
PT ratio
PUTT
Ingression Protection, According to IEC standard, level 40
Ingression Protection, According to IEC standard, level 54
International Telecommunications Union
Local Area Network
High voltage software module
Liquid Crystal Display
Line Differential Communication Module
Local detection device
Light Emitting Diode
LION 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
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 over-reaching when the impedance pre-
sented to it is smaller than the apparent impedance to the fault applied
to the balance point, i.e. the set reach. The relay "sees" the fault but per-
haps it should not have seen it.
Peripheral Component Interconnect, a local data bus
Pulse code modulation
Protection and Control IED 600 Manager
Process interface for sensors & actuators
Permissive overeach transfer trip
Bus or LAN used at the process level, that is, in near proximity to the
measured and/or controlled components
Power supply module
Parameter setting tool
Potential transformer or voltage transformer ratio
Permissive underreach transfer trip
Chapter 14
Glossary
187