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 505 293-UUS A Section 9
Glossary
137
Commissioning manual
To Next Page
Loading...
Need help?
General
