-ETHOD OF OPERATION
3*
6
# ' #
%XECUTION AND MONITORING OF THE COMMAND
4HE COMMAND EXECUTION IS INITIATED BY PUSHING THE
COMMAND RELEASE KEY #ORRESPONDING ANNUNCI
ATIONS ARE CREATED INSIDE THE RELAY CONTAINING THE
BREAKER DESIGNATION THE CONTROL SOURCE THE TYPE
COMMAND OR FEEDBACK THE RESULT POSITIVE OR NEG
ATIVE AND THE SWITCHING DIRECTION4ABLE LISTS THE
COMMAND ANNUNCIATIONS AND THEIR MEANING 7HEN
ALL CONDITIONS ARE FULFILLED AND THE COMMAND RELAY IS
MARSHALLED ACCORDINGLY THE COMMAND IS GIVEN &IG
URE SHOWS AN EXAMPLE OF THE PROCEDURE AND
SOME ANNUNCIATIONS OF THE COMMAND INPUT 4HE AN
NUNCIATIONS ARE SHOWN BELOW THE FEEDER MIMIC DIA
GRAM INSTEAD OF THE BAR INDICATION OF THE HIGHEST
PHASE CURRENT
4OGETHER WITH THE COMMAND OUTPUT A MONITORING
TIME IS STARTED COMMAND RUNNING TIME MONITORING
TO CHECK WHETHER THE CIRCUIT BREAKER REACHES THE DE
SIRED FINAL STATE WITHIN THIS TIME SEE &IGURE
5PON RECEIVING THE BREAKER STATE FEEDBACK SIGNAL
THE COMMAND RELAY DROPS OUT AND THE MONITORING
TIME IS STOPPED )N CASE OF A MISSING FEEDBACK THE
ALARM COMMAND RUNNING TIME EXPIRED
#2 TIME
EXP
IS GIVEN
!NY SWITCHING COMMAND CAN ALWAYS BE INTERRUPTED
BY A PROTECTION TRIP COMMAND
4IME OUT OF THE COMMAND RUNNING
TIME
4HE RELAY S REACTION TO THE ALARM COMMAND RUNNING
TIME EXPIRED
#2 TIME EXP
CAN BE PARAMETER
IZED TO MAKE SURE THAT THE CANCELLATION OF THE COM
MAND DOES NOT DAMAGE THE COMMAND RELAY )T CAN
BE SELECTED WHETHER THE RUNNING SWITCHING COM
MAND SHALL DROP OUT AFTER EXCEEDING THE MONITORING
TIME OR WHETHER IT SHALL BE MAINTAINED AND FAILURE OF
THE SWITCHING COMMAND SHALL ONLY BE INDICATED BY
ALARM RELAYS OR ,%$S )N THIS CASE THE SWITCHING COM
MAND REMAINS ACTIVE UNTIL RECEIVING THE CORRESPOND
ING BREAKER STATE FEEDBACK SIGNAL
7HEN THE COMMAND RUNNING TIME IS EXPIRED THE IN
TERMEDIATE STATE MONITOR FOR THE CORRESPONDING
SWITCHING DEVICE IS REACTIVATED )F AN INTERMEDIATE
STATE IS DETECTED THEN THE PARAMETERIZED FEEDBACK
TIME DELAY 4 &" #" IS DISREGARDED
#OMMAND EXTENSION TIME
)N ORDER TO MAKE SURE THAT THE BREAKER REACHES ITS FI
NAL POSITION IT IS IN SOME CASES NECESSARY TO KEEP THE
COMMAND RELAY ENERGIZED FOR A DEFINED TIME AFTER RE
CEIVING THE FEEDBACK SIGNAL &OR THIS PURPOSE A COM
MAND EXTENSION TIME 4
%84 #"
IS PROVIDED
4
%84 #"
FLASHING OF THE
OPERATED DEVICE
START
COMMAND OUTPUT
START MONITOR
OF THE COMMAND
RUNNING TIME
MONITOR OF
THE FEED BACK
S
0
END COMMAND
OUTPUT
MONITORING
OF THE EXPECTED
FEEDBACK SIGNAL
END
FLASHING
4
&" #"
RECEPTION OF THE
EXPECTED
FEEDBACK SIGNAL
4 3&" %.$
COMMAND
EXTENSION TIME
S
34/03 34/03 ./4
42)0 #-$
&IGURE 'ENERAL COMMAND PROCESS
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