GL.5
Date Code 20090715 SEL-421 Relay
Glossary
CID File—COMTRADE
CID File
IEC 61850 Configured IED Description file. XML file that contains the
configuration for a specific IED.
Circuit Breaker
Failure Logic
This logic within the SEL-421 detects and warns of failure or incomplete
operation of a circuit breaker in clearing a fault or in performing a trip or close
sequence.
Circuit Breaker
History Report
A concise circuit breaker event history that contains as many as 128 events.
This breaker history report includes circuit breaker mechanical operation
times, electrical operation times, interrupted currents, and dc battery monitor
voltages.
Circuit Breaker Report
A full report of breaker parameters for the most recent operation. These
parameters include interrupted currents, number of operations, and
mechanical and electrical operating times among many parameters.
Class
The first level of the relay settings structure including Global, Group, Breaker
Monitor, Port, Report, Front Panel, DNP settings, Protection SEL
OGIC control
equations, Automation SEL
OGIC control equations, and Output SELOGIC
control equations.
Cold Start
Beginning a system from power up without carryover of previous system
activities.
Commissioning Testing
Testing that serves to validate all system ac and dc connections and confirm
that the relay, auxiliary equipment, and SCADA interface all function as
intended with your settings. Perform such testing when installing a new
protection system.
Common
Class Components
Composite data objects that contain instances of UCA standard data types.
Common Data Class
IEC 61850 grouping of data objects that model substation functions. Common
Data Classes include Status information, Measured information, Controllable
status, Controllable analog, Status settings, Analog settings, and Description
information.
Common Inputs
Relay control inputs that share a common terminal.
Common Time Delay
Both ground and phase distance protection follow a common time delay on
pickup.
Common Zone Timing
Both ground and phase distance protection follow a common time delay on
pickup.
Communications Protocol
A language for communication between devices.
Communications-Assisted
Tripping
Circuit breaker tripping resulting from the transmission of a control signal
over a communications medium.
Comparison
Boolean SELOGIC control equation operation that compares two numerical
values. Compares floating-point values such as currents, total counts, and
other measured and calculated quantities.
COMTRADE
Abbreviation for Common Format for Transient Data Exchange. The SEL-421
supports the IEEE Standard Common Format for Transient Data Exchange
(COMTRADE) for Power Systems, IEEE C37.111–1999.
Courtesy of NationalSwitchgear.com
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