GL.2
SEL-751 Relay Instruction Manual Date Code 20170927
Glossary
Arc-Flash Protection (Relay)—CRC-16
Point Sensor—The fiber-optic cable sensor with a light diffuser on the
end and used for arc-flash detection.
Arc-Flash Protection
(Relay)
An action performed by the relay to minimize the arc-flash hazard.
Arc-Flash Hazard
A dangerous condition associated with the release of energy caused by an
electric arc.
ASCII
Abbreviation for American Standard Code for Information Interchange.
Defines a standard way to communicate text characters between two
electronic devices. The SEL-751 Feeder Protection Relay uses ASCII text
characters to communicate through the relay front- and rear-panel EIA-232 serial
ports.
Assert
To activate; to fulfill the logic or electrical requirements necessary to operate a
device. To apply a short-circuit or closed contact to an SEL-751 input. To set a
logic condition to the true state (logical 1). To close a normally-open output
contact. To open a normally-closed output contact.
AST
Arc Sense technology used for the high-impedance fault (HIF) detection
elements.
Bay Screen Builder
SEL-5036 Software
An intuitive and powerful interface to design bay screens to meet application
needs.
Best Choice Ground
Directional Element Logic
An SEL logic that determines the directional element that the relay uses for
ground faults.
Breaker
Auxiliary Contact
A spare electrical contact associated with a circuit breaker that opens or closes
to indicate the breaker position. A Form A breaker auxiliary contact (ANSI
Standard Device Number 52A) closes when the breaker is closed, opens when
the breaker is open. A Form B breaker auxiliary contact (ANSI Standard
Device Number 52B) opens when the breaker is closed and closes when the
breaker is open.
C37.118
C37.118 IEEE Standard for Synchrophasors for Power Systems.
Checksum
A numeric identifier of the firmware in the relay. Calculated by the result of a
mathematic sum of the relay code.
CID
Abbreviation for Checksum Identifier. The checksum of the specific firmware
installed in the relay.
CID File
IEC 61850 Configured IED Description file. XML file that contains the
configuration for a specific IED.
COMTRADE
Abbreviation for Common Format for Transient Data Exchange. The SEL-751
supports the IEEE Standard Common Format for Transient Data Exchange
(COMTRADE) for Power Systems, IEEE C37.111–1999.
Contiguous
Items in sequence; the second immediately following the first.
CR_RAM
Abbreviation for Critical RAM. Refers to the area of relay random-access
memory (RAM) where the relay stores mission-critical data.
CRC-16
Abbreviation for Cyclical Redundancy Check-16. A mathematical algorithm
applied to a block of digital information to produce a unique, identifying
To Next Page
Loading...
