GL.10
SEL-400 Series Relays Instruction Manual Date Code 20171006
Glossary
EIA-485—Fast Hybrid Control Output
EIA-485
Electrical standard for multidrop serial data communications interfaces, based on
the standard EIA/TIA-485. Formerly known as RS-485.
Electrical Operating Time
Time between trip or close initiation and an open-phase status change.
Electromechanical Reset
Setting of the relay to match the reset characteristics of an electromechanical
overcurrent relay.
End-Zone Fault
A fault at the farthest end of a zone that a relay is required to protect.
Energy Metering
Energy metering provides a look at imported power, exported power, and net
usage over time; measured in MWh (megawatt hours).
Equalize Mode
A procedure where substation batteries are overcharged intentionally for a
preselected time in order to bring all cells to a uniform output.
ESD
(Electrostatic Discharge)
The sudden transfer of charge between objects at different potentials caused by
direct contact or induced by an electrostatic field.
EtherCAT
(Ethernet for Control
Automation Technology)
An Ethernet-based network protocol for high-speed control networks that require
real-time performance and ease of network configuration.
Ethernet
A network physical and data link layer defined by IEEE 802.2 and IEEE 802.3.
Event History
A quick look at recent relay activity that includes a standard report header; event
number, date, time, and type; fault location; maximum fault phase current; active
group at the trigger instant; 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, fault location, time source, recloser shot
counter, prefault and fault voltages, currents, and sequence current, and
M
IRRORED BITS communications channel status (if enabled).
The relay sends an event report summary (if auto messaging is enabled) to the
relay serial port a few seconds after an event.
External Fuse
Fuse external to a capacitor unit (usually mounted on the unit).
EXP Operator
Math SELOGIC control equation operator that provides exponentiation.
F_TRIG
Falling-edge trigger. Boolean SELOGIC control equation operator that triggers an
operation upon logic detection of a falling edge.
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.
Fast Hybrid Control
Output
A control output similar to, but faster than, the hybrid control output. The fast
hybrid output uses an insulated-gate bipolar junction transistor (IGBT) to
To Next Page
Loading...
