ABB RER620 Technical Manual page 580

Section 16
Glossary
HMI Human-machine interface
HW Hardware
IDMT Inverse definite minimum time
IEC 61850 International standard for substation communication and modelling
Relay Intelligent electronic device
IP Internet protocol
IP address A set of four numbers between 0 and 255, separated by periods. Each server connected to
the Internet is assigned a unique IP address that specifies the location for the TCP/IP
protocol.
IRIG-B Inter-Range Instrumentation Group's time code format B
LAN Local area network
LC Connector type for glass fiber cable
LCD Liquid crystal display
LED Light-emitting diode
LHMI Local human-machine interface
Modbus A serial communication protocol developed by the Modicon company in 1979. Originally used
for communication in PLCs and RTU devices.
MV Medium voltage
NPS Negative Phase Sequence
PC Personal computer; Polycarbonate
PCM600 Protection and Control Relay Manager
Peak-to-peak The amplitude of a waveform between its maximum positive value and its maximum negative
value; 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 A measurement principle similar to the peak-to-peak mode but with the function picking up
with peak on two conditions: the peak-to-peak value is above the set pickup current or the peak value
backup is above two times the set pickup value
RAM Random access memory
RCA Also known as MTA or base angle. Characteristic angle.
RJ-45 Galvanic connector type
RMS Root-mean-square (value)
ROM Read-only memory
RTC Real-time clock
RTS Ready to send
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RER620
Technical Manual