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9. Abbreviations
Abbreviation Description
AR Auto reclosure
ASCII American Standard Code for Information Interchange
CB Circuit-breaker
CBFP Circuit-breaker failure protection
CD Change detect; compact disk
CPU Central processing unit
CRC Cyclical redundancy check
DI Digital input
EEPROM Electrically Erasable Programmable Read-Only Memory
EMC Electromagnetic compatibility
EPA Enhanced Performance Architecture
ER Event records
FR Fault record
GI General interrogation
HMI Human-machine interface
HR Holding register
IDMT Inverse definite minimum time characteristic
IEC International Electrotechnical Commission
IEC_103 Standard IEC 60870-5-103
IED Intelligent electronic device
IEEE Institute of Electrical and Electronics Engineers, Inc.
IR Input register
IRF Internal relay fault
ISO International Organization for Standardization
LCD Liquid crystal display
LED Light-emitting diode
LRC Longitudinal redundancy check
MP Minute-pulse
MSB Most significant bit
MV Medium voltage
NACK Negative acknowledgments
NC Normally closed
NO Normally open
OSI Open System Interconnection
PC Personal computer
PCB Printed circuit board
PLC Programmable logical controller
PO Power output, process object
RMS Root mean square
RTU Remote terminal unit
Feeder Protection Relay
Technical Reference Manual
REF 610REF 610
1MRS755310
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