ABB REG650 Technical Manual page 668

Section 22
Glossary
662
COMTRADE Standard Common Format for Transient Data Exchange format
for Disturbance recorder according to IEEE/ANSI C37.111,
1999 / IEC60255-24
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
CPU Central processor unit
CR Carrier receive
CRC Cyclic redundancy check
CROB Control relay output block
CS Carrier send
CT Current transformer
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/ANSI Std. 1379-2000
DR Disturbance recorder
DRAM Dynamic random access memory
DRH Disturbance report handler
DSP Digital signal processor
DTT Direct transfer trip scheme
EHV network Extra high voltage network
EIA Electronic Industries Association
1MRK 502 043-UUS B
Technical Manual