IRIG-B:
InterRange Instrumentation Group Time code format B,
standard 200
ITU
International Telecommunications Union
LAN
Local area network
LCD
Liquid crystal display
LDD
Local detection device
LED
Light-emitting diode
LNT
LON network tool
MCB
Miniature circuit breaker
MVAL
Value of measurement
NCC
National Control Centre
NOF
Number of grid faults
NUM
Numerical module
OCO cycle
Open-close-open cycle
OCP
Overcurrent protection
OLTC
On-load tap changer
OTEV
Disturbance data recording initiated by other event than start/
pick-up
OV
Over-voltage
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
PCM600
Protection and control IED manager
PC-MIP
Mezzanine card standard
POR
Permissive overreach
POTT
Permissive overreach transfer trip
Process bus
Bus or LAN used at the process level, that is, in near proximity
to the measured and/or controlled components
PSM
Power supply module
PST
Parameter setting tool within PCM600
1MRK 511 281-UUS A
Section 9
Glossary
650 series ANSI
231
Communication protocol manual
Summary of Contents for Relion 650 series ANSI
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