701 Motor Protection Relay
Date Code 20010719
Glossary
RMS–Underfrequency Element
GL.8
RMS
Abbreviation for Root-Mean-Squared. Refers to the
effective value of the sinusoidal current and voltage
measured by the relay, accounting for the fundamental
frequency and higher order harmonics in the signal.
ROM
Abbreviation for Read-Only Memory. Nonvolatile
memory where the relay firmware is stored.
RTD
Abbreviation for Resistance Temperature Device. An
RTD is made of a metal having a precisely known
resistance and temperature coefficient of resistance.
The SEL-701 Relay and SEL-2600 RTD Module can
measure the resistance of the RTD, and thus, determine
the temperature at the RTD location. Typically
embedded in the motor windings or attached to the
races of bearings.
Self-Test
A function that verifies the correct operation of a
critical device subsystem and indicates if an out-of-
tolerance condition is detected. The SEL-701 Relay is
equipped with self-tests that validate the relay power
supply, microprocessor, memory, and other critical
systems.
SEL
OGIC
â
Control Equation
A relay setting that allows you to control a relay
function (such as an output contact) using a logical
combination of relay element outputs and fixed logic
outputs. Logical AND, OR, INVERT, Rising Edge [/],
and Falling Edge [\] operators, plus a single level of
parentheses are available to use in each control
equation setting.
Sequential
Events Recorder
A relay function that stores a record of the date and
time of each assertion and deassertion of every Relay
Word bit in a user settable list. Provides a useful way to
determine the order and timing of events following a
relay operation.
SER
Abbreviation for Sequential Events Recorder or the
relay serial port command to request a report of the
latest 512 sequential events.
Speed Switch
An electrical contact that closes to indicate that a motor
speed exceeds a certain value.
Terminal
Emulation Software
Personal computer (PC) software that can be used to
send and receive ASCII text messages via the PC serial
port, such as Microsoft
â
Hyperterminal
ä
or ProComm
Plus
ä
.
Underfrequency
Element
A protection element that causes the relay to trip when
the measured electrical system frequency is less than a
user settable frequency.
Содержание SEL-701
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