GL.6
SEL-400 Series Relays Instruction Manual Date Code 20171006
Glossary
Class—Contact Output
Class
The first level of the relay settings structure including Global, Group, Breaker
Monitor, Port, Report, Front Panel, DNP3 settings, Protection SEL
OGIC control
equations, Automation SEL
OGIC control equations, and Output SELOGIC control
equations.
Cold Start
Turning a system on without carryover of previous system activities.
Combined Winding
Mathematical combination (in the SEL-400) of currents from two separate sets of
CT on the same voltage level, typical of breaker-and-a-half busbar
configurations.
Commissioning Assistant
Software used during transformer commissioning that checks for typical (single-
contingency) wiring errors; The software uses load current to calculate the
correct matrix combinations for as many as five windings.
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.
Computer Terminal
Emulation Software
Software such as Microsoft HyperTerminal or ProComm Plus that can be used to
send and receive ASCII text messages and files via a computer serial port.
COMTRADE
Abbreviation for Common Format for Transient Data Exchange. The relay
supports the IEEE Std C37.111–1999, Common Format for Transient Data
Exchange (COMTRADE) for Power Systems.
Conditioning Timers
Timers for conditioning Boolean values. Conditioning timers either stretch
incoming pulses or allow you to require that an input take a state for a certain
period before reacting to the new state.
Contact Input
See Control Input.
Contact Output
See Control Output.
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