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Class C
Protection Current Transformer class as per IEEE/ ANSI
CMPPS
Combined megapulses per second
CMT
Communication Management tool in PCM600
CO cycle
Close-open cycle
Codirectional
Way of transmitting G.703 over a balanced line. Involves two twisted pairs
making it possible to transmit information in both directions
COM
Command
COMTRADE
Standard Common Format for Transient Data Exchange format for
Disturbance recorder according to IEEE/ANSI C37.111, 1999 / IEC 60255-24
Contra-directional
Way of transmitting G.703 over a balanced line. Involves four twisted pairs,
two of which are used for transmitting data in both directions and two for
transmitting clock signals
COT
Cause of transmission
CPU
Central processing unit
CR
Carrier receive
CRC
Cyclic redundancy check
CROB
Control relay output block
CS
Carrier send
CT
Current transformer
CU
Communication unit
CVT or CCVT
Capacitive voltage transformer
DAR
Delayed autoreclosing
DARPA
Defense Advanced Research Projects Agency (The US developer of the
TCP/IP protocol etc.)
DBDL
Dead bus dead line
DBLL
Dead bus live line
DC
Direct current
DFC
Data flow control
DFT
Discrete Fourier transform
DHCP
Dynamic Host Configuration Protocol
DIP-switch
Small switch mounted on a printed circuit board
DI
Digital input
DLLB
Dead line live bus
DNP
Distributed Network Protocol as per IEEE Std 1815-2012
DR
Disturbance recorder
DRAM
Dynamic random access memory
DRH
Disturbance report handler
DSP
Digital signal processor
DTT
Direct transfer trip scheme
Section 27
1MRK 502 066-UUS B
Glossary
1418
Technical manual
Summary of Contents for Relion 670 series
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