ABB RELION 670 Series Installation Manual page 106

Section 10
Glossary
100
MPM
MVAL
MVB
NCC
NOF
NUM
OCO cycle
OCP
OEM
OLTC
OTEV
OV
Overreach
PCI
PCM
PCM600
PC-MIP
PELV circuit
PMC
POR
POTT
Process bus
PRP
PSM
PST
PTP
PT ratio
PUTT
Main processing module
Value of measurement
Multifunction vehicle bus. Standardized serial bus
originally developed for use in trains.
National Control Centre
Number of grid faults
Numerical module
Open-close-open cycle
Overcurrent protection
Optical Ethernet module
On-load tap changer
Disturbance data recording initiated by other event than
start/pick-up
Overvoltage
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
Mezzanine card standard
Protected Extra-Low Voltage circuit type according to
IEC60255-27
PCI Mezzanine card
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
Parallel redundancy protocol
Power supply module
Parameter setting tool within PCM600
Precision time protocol
Potential transformer or voltage transformer ratio
Permissive underreach transfer trip
1MRK 514 026-UEN B
670 series 2.2 IEC
Installation manual