GL.2
SEL-587Z Relay Date Code 20020903
Glossary
Apparent Power, S—Boolean Logic Statements
79 Recloser
86 Breaker Failure Lockout
87 Differential
89 Disconnect
These numbers are frequently used within a suffix letter to further designate
their application. The suffix letters used in this instruction manual include the
following:
P Phase Element
G Residual/Ground Element
N Neutral/Ground Element
Q Negative-Sequence (3I2) Element
Apparent Power, S
Complex power expressed in units of volt-amps (VA), kilovolt-amps (kVA), or
megavolt-amps (MVA). Accounts for both real (P) and reactive (Q) power
dissipated in a circuit: S = P + jQ. This is power at the fundamental frequency
only; no harmonics are included in this quantity.
Arcing Resistance
The resistance in the arc resulting from a power line fault.
ASCII
Abbreviation for American Standard Code for Information Interchange.
Defines a standard set of text characters. The SEL-587Z Relay uses ASCII
text characters to communicate using front-panel and rear-panel EIA-232
serial ports on the relay.
ASCII Terminal
A terminal without built-in logic or local processing capability that can only
send and receive information.
Assert
To activate. To fulfill the logic or electrical requirements needed to operate a
device. To set a logic condition to the true state (logical 1) of that condition.
To apply a closed contact to an SEL-587Z Relay input. To close a normally
open output contact. To open a normally closed output contact.
AT Modem Command Set
Dialing String Standard
The command language standard that Hayes Microcomputer Products, Inc.
developed to control auto-dial modems from an ASCII terminal (usually
EIA-232 connected) or a PC (personal computer) containing software
allowing emulation of such a terminal.
Autoconfiguration
The ability to determine relay type, model number, metering capability, port
ID, baud rate, passwords, relay elements, and other information that an IED
(an SEL-2020/2030 communications processor) needs to automatically
communicate with relays.
Automatic Messages
Messages including status failure and status warning messages that the relay
generates at the serial ports and displays automatically on the front-panel
LCD.
Autotransformer
A transformer with at least two common windings.
Bandpass Filter
A filter that passes frequencies within a certain range and blocks all
frequencies outside this range.
Bolted Fault
A fault with essentially zero impedance or resistance between the shorted
conductors.
Boolean Logic Statements
Statements consisting of variables that behave according to Boolean logic
operators such as AND, NOT, and OR.
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