
4
Introduction to the operator’s manual
&KDSWHU
,QWURGXFWLRQ
&6
Carrier send
&7
Current transformer
&97
Capacitive voltage transformer
'$5
Delayed auto-reclosing
'63
Digital signal processor
',3VZLWFK
Small switch mounted on a printed circuit board
'77
Direct transfer trip scheme
(+9QHWZRUN
Extra high voltage network
(,$
Electronic Industries Association
(0&
Electro magnetic compatibility
(0,
Electro magnetic interference
(6'
Electrostatic discharge
)2;
Modular 20 channel telecommunication system for speech, data
and protection signals
)2;
Access multiplexer
)2; 3OXV
Compact, time-division multiplexer for the transmission of up to
seven duplex channels of digital data over optical fibers
*
Electrical and functional description for digital lines used by local
telephone companies. Can be transported over balanced and un-
balanced lines
*
Standard for pulse code modulation of analog signals on digital
lines
*,
General interrogation command
*,6
Gas insulated switchgear.
*36
Global positioning system
+'/&SURWRFRO
High level data link control, protocol based on the HDLC standard
+0,
Human-Machine Interface
+6$5
High-Speed Auto-Reclosing
+9'&
High voltage direct current
,'%6
Integrating dead-band supervision
,(&
International Electrical Committee
,(&
IEC Standard, Instrument transformers – Part 6: Requirements for
protective current transformers for transient performance
,(&
Communication standard for protective equipment. A serial master/
slave protocol for point-to-point communication
Summary of Contents for REL 551 2.5
Page 1: ...Operator s manual ProtectIT Line differential protection terminal REL 551 2 5 ...
Page 51: ...44 Test the LEDs of the LED module KDSWHU DQGOH WKH GLVWXUEDQFHV ...
Page 71: ...64 Determine the active setting group KDSWHU 9LHZ WKH VHUYLFH UHSRUW ...
Page 87: ...80 Retrieve the rated values of analog inputs KDSWHU 9LHZ WKH WHUPLQDO XQLW VWDWXV ...