ABB 650 Series Engineering Manual page 125

1MRK 511 284-UEN A
650 series
Engineering manual
OLTC
OTEV
OV
Overreach
PCI
PCM600
PC-MIP
POR
POTT
Process bus
PSM
PST
PT ratio
PUTT
RCA
RISC
RMS value
RS422
RS485
RTC
RTU
SA
SBO
SC
SCL
SCS
SCADA
SCT
SDU
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
Potential transformer or voltage transformer ratio
Permissive underreach transfer trip
Relay characteristic angle
Reduced instruction set computer
Root mean square value
A balanced serial interface for the transmission of digital
data in point-to-point connections
Serial link according to EIA standard RS485
Real-time clock
Remote terminal unit
Substation Automation
Select-before-operate
Switch or push button to close
Short circuit location
Station control system
Supervision, control and data acquisition
System configuration tool according to standard IEC 61850
Service data unit
Section 10
Glossary
119