ABB Relion Technical Manual page 773

1MRK 502 048-UUS A
Technical manual
IRIG-B:
ITU
LAN
LCD
LDD
LED
LNT
MCB
MVAL
NCC
NOF
NUM
OCO cycle
OCP
OLTC
OTEV
OV
Overreach
PCI
PCM600
PC-MIP
POR
POTT
Process bus
PSM
PST
InterRange Instrumentation Group Time code format B,
standard 200
International Telecommunications Union
Local area network
Liquid crystal display
Local detection device
Light-emitting diode
LON network tool
Miniature circuit breaker
Value of measurement
National Control Centre
Number of grid faults
Numerical module
Open-close-open cycle
Overcurrent protection
On-load tap changer
Disturbance data recording initiated by other event than start/
pick-up
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
Protection and control IED manager
Mezzanine card standard
Permissive overreach
Permissive overreach 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 within PCM600
Section 22
Glossary
767