ABB RELION REX640 Technical Manual page 1756

Section 17
Glossary
1750
Modbus
Modbus ASCII
Modbus RTU
MSB
MV
NC
NPS
NRP
NSCB
OSB
P2P
PC
PCL
PCM600
Peak-to-peak
Peak-to-peak with
peak backup
PGU
PLC
PO
PODP
POSP
POTT
PPS
PRP
PTP
A serial communication protocol developed by the
Modicon company in 1979. Originally used for
communication in PLCs and RTU devices.
Link mode using 7-bit ASCII characters
Link mode using 8-bit binary characters
Most significant bit
Medium voltage
Normally closed
Negative phase sequence
Negative reactance principle
Non-source circuit breaker
Out of step blocking
peer-to-peer
1. Personal computer
2. Polycarbonate
Product connectivity level
Protection and Control IED Manager
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.
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
Power generating unit
Programmable logic controller
Power output
Power output, double pole
Power output, single pole
Permissive overreach transfer trip
Pulse per second
Parallel redundancy protocol
Precision Time Protocol
1MRS759142 C
REX640
Technical Manual