GL.9
Date Code 20020903
SEL-587Z Relay
Glossary
RTU
—
Thermal Demand
RTU
Remote Terminal Unit.
RXD
Received data.
SCADA
Supervisory control and data acquisition.
Self-Test
A function that verifies the correct operation of a critical device subsystem
and indicates detection of an out-of-tolerance condition. The SEL-587Z Relay
has self-tests that validate the relay power supply, microprocessor, memory,
and other critical systems.
SEL
OGIC
Control Equation
A relay setting that allows you to control a relay function (such as a control
output) using a logical combination of relay element outputs and fixed logic
outputs.
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 list that you set in the relay. SER
provides a useful way to determine the order and timing of events of a relay
operation.
SER
Sequential Events Recorder or the relay serial port command to request a
report of the latest 512 sequential events.
Settle/Settling Time
Time required for an input signal to result in an unvarying output signal within
a specified range.
Shunt Admittance
The admittance resulting from the presence of a device in parallel across other
devices or apparatus that diverts some current away from these devices or
apparatus.
Shunt Capacitance
The capacitance between a network connection and any existing ground.
Shunt Current
The current that a parallel-connected high-resistance or high-impedance
device diverts away from devices or apparatus.
Source Impedance
The impedance of an energy source at the input terminals of a device or
network.
Status Failure
A severe out-of-tolerance internal operating condition. The relay issues a
status failure message and enters a protection-disabled state.
Status Warning
Out-of-tolerance internal operating conditions that do not compromise relay
protection, yet are beyond expected limits. The relay issues a status warning
message and continues to operate.
Strong Password
A mix of valid password characters in a six-character combination that does
not spell common words in any portion of the password. Valid password
characters are numbers, upper- and lower-case alphabetic characters, “.”
(period), and “-” (hyphen).
Terminal
Emulation Software
Software such as Microsoft
®
HyperTerminal or ProComm
®
Plus that can be
used to send and receive ASCII text messages and files via a computer serial
port.
Thermal Demand
Thermal demand is a continuous exponentially increasing or decreasing
accumulation of metered quantities; used in demand metering.
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