Glossary - Siemens SICAM Manual

Glossary

AREC
Function or process for automatic reclosing a circuit breaker after tripping by a protection.
FPI
Fault passage indicator: The fault passage indicator is a device that is used for detection and signaling of phase
fault (short circuit) and ground fault on medium-voltage cable networks.
HMI
Human-machine interface: The term user interface is often used in the context of computer systems and elec-
tronic devices. The user interface of a mechanical system, a vehicle or an industrial installation is sometimes
referred to as the human-machine interface (HMI).
LPCT
Low-power current transformers: The low-power current transformers provide a voltage at the output which is
proportional to the input current.
LSB
Least significant bit: The least significant bit is the bit position in a binary integer giving the units value.
MLFB
Machine-readable product designation: The machine-readable product designation is equivalent to the order
number.
Modbus RTU
Modbus remote terminal unit: The Modbus remote terminal unit is a Modbus protocol type for transmitting
the data over serial networks, for example, RS485.
MTA
Maximum torque angle: The maximum torque angle is defined as an angle by which the current applied to the
relay must be displaced from the voltage applied to the relay to produce maximum torque.
RMS value
Root-mean-square value: Energetically equivalent value of direct voltage to alternating voltage. For a
harmonic alternating voltage, the RMS value corresponds to the square root of the integral of the squares.
RMU
The ring main unit is a modular extendable metal-clad switchgear designed primarily for the distribution appli-
cations.
RS485 interface
The RS485 interface is a standard for digital, wire-based, differential, and serial data transmission.
SICAM, Feeder Condition Monitor, Manual
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