Term Description
CRP Cross-network Redundancy Protocol
CRV Curve (file format for curve information)
CRx Channel Receive: Typically used to indicate a teleprotection signal received.
CS Check Synchronism.
CSV Comma Separated Values (a file format for database information)
CT Current Transformer
CTRL. Control
CTS Current Transformer Supervision: To detect CT input failure.
CTx Channel Transmit: Typically used to indicate a teleprotection signal send.
CU Communication Unit
CVT Capacitor-coupled Voltage Transformer - equivalent to terminology CCVT.
DAU Data Acquisition Unit
DC Data Concentrator
DC / dc Direct Current
DCC An Omicron compatible format
DDB
Digital Data Bus within the programmable scheme logic: A logic point that has a zero or 1 status.
DDB signals are mapped in logic to customize the relay’s operation.
DDR Dynamic Disturbance Recorder
DEF Directional earth fault protection: A directionalized ground fault aided scheme.
DG Distributed Generation
DHCP Dynamic Host Configuration Protocol
DHP Dual Homing Protocol
Diff Differential protection.
DIN Deutsches Institut für Normung (German standards body)
Dist Distance protection.
DITA Darwinian Information Typing Architecture
DLDB
Dead-Line Dead-Bus: In system synchronism check, indication that both the line and bus are de-
energized.
DLLB
Dead-Line Live-Bus: In system synchronism check, indication that the line is de-energized whilst
the bus is energized.
DLR Dynamic Line Rating
DLY / Dly Time Delay
DMT Definite Minimum Time
DNP Distributed Network Protocol
DPWS Device Profile for Web Services
DST Daylight Saving Time
DT
Definite Time: in the context of protection elements:
An element which always responds with the same constant time delay on operation.
Abbreviation of "Dead Time" in the context of auto-reclose:
DTD Document Type Definition
DTOC Definite Time Overcurrent
DTS Date and Time Stamp
EF or E/F Earth Fault (Directly equivalent to Ground Fault)
EIA Electronic Industries Alliance
ELR Environmental Lapse Rate
MiCOM P747 Appendix A - Symbols and Glossary
P747-TM-EN-1 409
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