-ETHOD OF OPERATION3*
6
#
' #
4RIP CIRCUIT SUPERVISION
4HE DEVICE INCLUDES AN TRIP CIRCUIT SUPERVISION FOR
ONE TRIP CIRCUIT $EPENDENT ON THE NUMBER OF BINARY
INPUTS WHICH ARE AVAILABLE FOR THIS PURPOSE SUPERVI
SION CAN BE EFFECTED WITH ONE OR TWO BINARY INPUTS
4HE RELAY IS INFORMED ABOUT THIS DURING CONFIGURA
TION )F THE CONFIGURATION AND THE MARSHALLED NUMBER
OF BINARY INPUTS DOE NOT COMPLY THE ALARM
350
-ARSH&AIL
IS OUTPUT 7HEN TWO BINARY INPUTS ARE
USED DISTURBANCES IN THE TRIP CIRCUIT CAN BE DETECTED
FOR EVERY SWITCHING CONDITION WHEN ONE BINARY INPUT
IS USED THOSE DISTURBANCES WHICH OCCUR DURING
CLOSED TRIP CONTACTS CANNOT BE DETECTED
! PRECONDITION FOR USE OF THE TRIP CIRCUIT SUPERVISION IS
THAT THE CONTROL VOLTAGE FOR THE CIRCUIT BREAKER IS
GREATER THAN THE SUM OF THE VOLTAGE DROPS OF THE TWO
BINARY INPUTS 5
CV
|5
") MIN
OR AT ONE BINARY INPUT
AND THE REPLACEMENT RESISTOR 2 3INCE EACH BINARY
INPUT NEEDS AT LEAST 6 SUPERVISION REQUIRES AT
LEAST 6 CONTROL VOLTAGE
&IGURE SHOWS THE LOGIC DIAGRAM OF THE ANNUNCI
ATIONS GENERATED BY THE TRIP CIRCUIT SUPERVISION
3UPERVISION USING TWO BINARY IN
PUTS
7HEN TWO BINARY INPUTS ARE USED THEY ARE CON
NECTED ACCORDING TO &IGURE ONE INPUT IN PARAL
LEL TO THE TRIP RELAY THE CIRCUIT OF WHICH IS TO BE SUPER
VISED THE OTHER IN PARALLEL TO THE CIRCUIT BREAKER AUXIL
IARY CONTACT
4HE BINARY INPUTS ARE ENERGIZED LOGICAL
( OR
SHORT
CIRCUITED LOGICAL , DEPENDING ON THE STATUS
OF THE TRIP RELAY AND THE CIRCUIT BREAKER
$URING NORMAL OPERATION IT IS NOT POSSIBLE THAT BOTH
THE BINARY INPUTS ARE DE
ENERGIZED LOGICAL , AT
THE SAME TIME UNLESS FOR THE SHORT TIME WHERE THE TRIP
RELAY HAS ALREADY CLOSED BUT THE BREAKER IS NOT YET
OPEN
)F BOTH THE BINARY INPUTS ARE DE
ENERGIZED CONTINU
OUSLY THIS INDICATES THAT EITHER THE TRIP CIRCUIT IS INTER
RUPTED OR THE TRIP CIRCUIT IS SHORT
CIRCUITED OR THE
CONTROL VOLTAGE FOR TRIPPING IS ABSENT OR THE BREAKER
HAS NOT PROPERLY OPERATED 4HUS THIS STATUS INDI
CATES A FAULT IN THE TRIP CIRCUIT
4HE STATUS OF THE TWO BINARY INPUTS IS CHECKED AP
PROXIMATELY EVERY MS !N INTENTIONAL TIME DELAY
FOR ALARM IS PRODUCED BY THREE REPEATED STATUS
CHECKS BEFORE AN ALARM IS GIVEN 4HIS PREVENTS FROM
FAULTY ALARMS DUE TO SHORT TRANSIENT OCCURRENCES
3UPERVISION USING ONE BINARY IN
PUT
7HEN ONLY ONE BINARY INPUT IS TO BE USED THIS IS CON
NECTED ACCORDING TO &IGURE IN PARALLEL TO THE TRIP
RELAY THE CIRCUIT OF WHICH IS TO BE SUPERVISED
4HE BINARY INPUT IS ENERGIZED LOGICAL
( AS LONG AS
THE TRIP RELAY IS NOT ENERGIZED AND THE TRIP CIRCUIT IS
HEALTHY
7HEN THE BINARY INPUT IS NOT ENERGIZED LOGICAL
,
THIS INDICATES THAT EITHER THE TRIP CONTACT IS CLOSED OR
THE TRIP CIRCUIT IS INTERRUPTED OR THE TRIP CIRCUIT IS
SHORT
CIRCUITED OR THE CONTROL VOLTAGE FOR TRIPPING IS
ABSENT !S THE TRIP CONTACTS MAY BE CLOSED DURING
HEALTHY TRIP CIRCUIT CONDITION ALARM MUST BE DELAYED
ACCORDINGLY 4HIS DELAY TIME IS ADJUSTABLE IN ORDER TO
BE MATCHED TO OTHER TRIP RELAYS WHICH OPERATE THE
SAME BREAKER &URTHERMORE AN INTENTIONAL TIME
DELAY FOR ALARM IS PRODUCED BY THREE REPEATED STATUS
CHECKS BEFORE AN ALARM IS GIVEN 4HIS PREVENTS FROM
FAULTY ALARMS DURING CLOSED TRIP CONTACTS
3INCE THE SECOND BINARY INPUT IS NOT AVAILABLE IN THIS
MODE IT MUST BE REPLACED BY A RESISTOR 2 WHICH IS
CONNECTED TO THE BREAKER AUXILIARY CONTACT !UX RE
FER TO &IGURE COMPARE WITH &IGURE 4HIS
ALLOWS TO DETECT DISTURBANCE IN THE TRIP CIRCUIT EVEN
WHEN THE BREAKER AUXILIARY CONTACT !UX IS OPEN AND
THE TRIP CONTACT IS RESET 4HE RESISTANCE OF 2 IS DIMEN
SIONED SUCH THAT THE TRIP COIL 4# MUST NOT BE ENER
GIZED WHEN THE CIRCUIT BREAKER IS OPEN AUXILIARY CON
TACT !UX OPEN !UX CLOSED ON THE OTHER HAND THE
BINARY INPUT MUST BE SAFELY ENERGIZED WHEN THE TRIP
CONTACT IS OPEN )NFORMATION ON HOW TO DIMENSION
THE RESISTOR ARE CONTAINED IN 3ECTION
ONLY FOR MODEL 3*J JJJJ JJJJ
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