P2P peer-to-peer
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 with-
out including the DC component. The peak-to-peak mode allows consid-
erable CT saturation without impairing the performance of the operation.
Peak-to-peak
with peak back-
up
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
PGU Power generating unit
PLC Programmable logic controller
PMS Power management system
PO Power output
PODP Power output, double pole
POSP Power output, single pole
POTT Permissive overreach transfer trip
PPS Pulse per second
PRP Parallel redundancy protocol
PST Parameter setting tool
PTP Precision time protocol
PUTT Permissive underreach transfer trip
RAM Random access memory
RCA Also known as MTA or base angle. Characteristic angle.
RIO600 Remote I/O unit
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
Rx Receive/Received
SA Substation automation
SAN Single attached node
SBO Select-before-operate
SCADA Supervision, control and data acquisition
1MRS759142 F Glossary
REX640
Technical Manual
1957
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