MVB
Multifunction vehicle bus. Standardized serial bus
originally developed for use in trains.
NCC
National Control Centre
NOF
Number of grid faults
NUM
Numerical module
OCO cycle
Open-close-open cycle
OCP
Overcurrent protection
OEM
Optical Ethernet module
OLTC
On-load tap changer
OTEV
Disturbance data recording initiated by other event than
start/pick-up
OV
Overvoltage
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
PCM
Pulse code modulation
PCM600
Protection and control IED manager
PC-MIP
Mezzanine card standard
PELV circuit
Protected Extra-Low Voltage circuit type according to
IEC60255-27
PMC
PCI Mezzanine card
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
PRP
Parallel redundancy protocol
PSM
Power supply module
PST
Parameter setting tool within PCM600
PTP
Precision time protocol
PT ratio
Potential transformer or voltage transformer ratio
PUTT
Permissive underreach transfer trip
RASC
Synchrocheck relay, COMBIFLEX
RCA
Relay characteristic angle
Section 13
1MRK 506 377-UEN C
Glossary
204
Railway application RER670 2.2 IEC
Commissioning manual
Summary of Contents for RELION RER670
Page 1: ...RELION 670 SERIES Railway application RER670 Version 2 2 IEC Commissioning manual...
Page 2: ......
Page 26: ...20...
Page 54: ...48...
Page 58: ...52...
Page 62: ...56...
Page 80: ...74...
Page 188: ...182...
Page 194: ...188...
Page 204: ...198...
Page 214: ...208...
Page 215: ...209...