
GL.5
Date Code 20020903
SEL-587Z Relay
Glossary
Event History
—
High-Impedance Differential Relay
Event History
A quick look at recent relay activity that includes a standard report header;
event number, date, time, and type; maximum fault phase current; and targets.
Event Report
A text-based collection of data stored by the relay in response to a triggering
condition, such as a fault or ASCII
TRI
command. The data show relay
measurements before and after the trigger, in addition to the states of
protection elements, relay inputs, and relay outputs each processing interval.
After an electrical system fault, use event reports to analyze relay and system
performance.
Event Summary
A shortened version of stored event reports. An event summary includes items
such as event date and time, event type, prefault and fault voltages, currents,
and sequence current.
The relay sends an event report summary (if auto messaging is enabled) to the
relay serial port a few seconds after an event.
Fail-Safe
Refers to an output that is open during normal relay operation and closed
when relay power is removed or if the relay fails. Configure alarm outputs for
fail-safe operation.
Falling Edge
Transition from logical 1 to logical 0.
Falling-Edge Trigger
Boolean SEL
OGIC
control equation operator that triggers an operation upon
logic detection of a falling edge. Represented by the \ symbol.
Fast Meter
SEL binary serial port command used to collect metering data with SEL
relays.
Fast Operate
SEL binary serial port command used to perform control with SEL relays.
FID
Relay firmware identification string. Lists the relay model, firmware version
and date code, and other information that uniquely identifies the firmware
installed in a particular relay.
Firmware
The nonvolatile program stored in the relay that defines relay operation.
Flash Memory
A type of nonvolatile relay memory used for storing large blocks of
nonvolatile data.
Fundamental Frequency
The component of the measured electrical signal with a frequency equal to the
normal electrical system frequency, usually 50 Hz or 60 Hz. Generally used to
differentiate between the normal system frequency and any harmonic
frequencies present.
Global Settings
General settings including those for relay and station identifiers, date format,
phase rotation, nominal system frequency.
Ground
Overcurrent Elements
Elements that operate by comparing a residual ground calculation of the three-
phase inputs with the residual overcurrent threshold setting. The relay asserts
ground overcurrent elements when a relay residual current calculation exceeds
ground current setting thresholds.
Hexadecimal Address
A register address consisting of a numeral with an “h” suffix or a “0x” prefix.
High-Impedance
Differential Relay
A device connected in parallel with paralleled CTs that form a differential
protection zone. During an external fault, the high-impedance forces
circulating fault current to flow through the saturated CT instead of the relay.
Содержание SEL-587Z
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