ABB Relion 611 Series, Technical Manual

Page: 531 / 536

PC 1. Personal computer
2. Polycarbonate
PCM600 Protection and Control IED Manager
Peak-to-peak 1. The amplitude of a waveform between its maximum
positive value and its maximum negative value
2. A measurement principle where the measurement
quantity is made by calculating the average from the
positive and negative peak values without including the
DC component. The peak-to-peak mode allows
considerable CT saturation without impairing the
performance of the operation.
Peak-to-peak with
peak backup
A measurement principle similar to the peak-to-peak
mode but with the function starting on two conditions:
the peak-to-peak value is above the set start current or
the peak value is above two times the set start value
PPS Pulse per second
PRP Parallel redundancy protocol
R/L Remote/Local
RAM Random access memory
RCA Also known as MTA or base angle. Characteristic
angle.
REB611 Busbar and multipurpose differential protection and
control relay
REF611 Feeder protection and control relay
REM611 Motor protection and control relay
REU611 Voltage protection and control relay
RJ-45 Galvanic connector type
RMS Root-mean-square (value)
ROM Read-only memory
RS-485 Serial link according to EIA standard RS485
RSTP Rapid spanning tree protocol
RTC Real-time clock
RTD Resistance temperature detector
SAN Single attached node
SBO Select-before-operate
SCADA Supervision, control and data acquisition
SCL XML-based substation description configuration
language defined by IEC 61850
1MRS757454 D
Section 15
Glossary
611 series 525
Technical Manual