8
Introduction to the technical reference manual
Chapter 1
Introduction
CVT
Capacitive voltage transformer
DAR
Delayed auto-reclosing
db
dead band
DBDL
Dead bus dead line
DBLL
Dead bus live line
DC
Direct Current
DIN-rail
Rail conforming to DIN standard
DIP-switch
Small switch mounted on a printed circuit board
DLLB
Dead line live bus
DSP
Digital signal processor
DTT
Direct transfer trip scheme
EHV network
Extra high voltage network
EIA
Electronic Industries Association
EMC
Electro magnetic compatibility
ENGV1
Enable execution of step one
ENMULT
Current multiplier used when THOL is used for two or more lines
EMI
Electro magnetic interference
ESD
Electrostatic discharge
FOX 20
Modular 20 channel telecommunication system for speech, data and
protection signals
FOX 512/515
Access multiplexer
FOX 6Plus
Compact, time-division multiplexer for the transmission of up to seven
duplex channels of digital data over optical fibers
FPGA
Field Programmable Gate Array
FRRATED
Rated system frequency
FSMPL
Physical channel number for frequency calculation
G.703
Electrical and functional description for digital lines used by local tele-
phone companies. Can be transported over balanced and unbalanced
lines
G.711
Standard for pulse code modulation of analog signals on digital lines
GCM
Communication interface module with carrier of GPS receiver module
GI
General interrogation command
GIS
Gas insulated switchgear.
GOOSE
Generic Object Orientated Substation Event
GPS
Global positioning system
GR
GOOSE Receive (interlock)
Summary of Contents for REL 551-C1*2.5
Page 1: ...Technical reference manual ProtectIT Line differential protection terminal REL 551 C1 2 5 ...
Page 23: ...14 Introduction to the technical reference manual Chapter 1 Introduction ...
Page 39: ...30 Technical data Chapter 2 General ...
Page 63: ...54 Blocking of signals during test BST Chapter 3 Common functions ...
Page 71: ...62 Line differential protection phase segregated DIFL Chapter 4 Line differential protection ...
Page 89: ...80 Thermal phase overload protection THOL Chapter 5 Current ...
Page 101: ...92 Event function EV Chapter 7 Logic ...
Page 163: ...154 Terminal diagrams Chapter 11 Diagrams Figure 39 REL 551 C1 with DC switch ...