-ETHOD OF OPERATION
6+
6
# ' #
COMMAND FROM THE ANGLE DIFFERENCE
AND THE FRE
QUENCY DIFFERENCE
F SUCH THAT THE VOLTAGES AT THE
BUS BAR AND THE FEEDER CIRCUIT ARE EXACTLY THE SAME
AT THE INSTANT THAT THE CIRCUIT BREAKER CONTACTS TOUCH
&OR THAT PURPOSE THE CIRCUIT BREAKER CLOSING TIME
MUST BE PROGRAMMED INTO THE RELAY &OR SYNCHRO
NOUS AND ASYNCHRONOUS SWITCHING DIFFERENT FRE
QUENCY DIFFERENCE LIMITS CAN BE PROGRAMMED
4HE SYNCHRONISM AND VOLTAGE CHECK FUNCTION OPER
ATES ONLY WHEN IT IS REQUESTED TO DO SO 4HIS REQUEST
CAN COME FROM THE INTERNAL AUTO RECLOSE FUNCTION
FROM THE MANUAL CLOSING COMMAND OR FROM AN EXTER
NAL AUTO RECLOSE RELAY BY BINARY INPUT
4HE SYNCHRO CHECK FUNCTION GIVES PERMISSION FOR
PASSAGE OF THE CLOSING COMMAND
/PTIONALLY A CLOSING COMMAND CAN BE GIVEN BY THE
SYNCHRO CHECK FUNCTION 4HIS CAN CONTROL THE CLOS
ING COIL OF THE CIRCUIT BREAKER OR !2 CLOSING COM
MAND AND SYNCHRO CHECK CLOSING COMMAND CAN
BE CONNECTED IN SERIES
4HE PERMISSION TIME WINDOW IS LIMITED BY AN ADJUST
ABLE SYNCHRONOUS MONITORING TIME 7ITHIN THIS PERI
OD THE PROGRAMMED CONDITIONS MUST HAVE BEEN
MET OTHERWISE CLOSING PERMISSION WILL NOT BE GIVEN
! NEW SYNCHRO CHECK SEQUENCE REQUIRES A NEW RE
QUEST
4HE RELAY INDICATES WHEN THE CONDITIONS FOR SYNCHRO
NISM ARE NOT FULFILLED INDEPENDENT OF A MEASURING RE
QUEST IE WHEN THE VOLTAGE MAGNITUDE DIFFERENCE
5 THE FREQUENCY DIFFERENCE
F OR THE ANGLE DIFFER
ENCE
EXCEED THE SET LIMITS ! PRECONDITION IS THAT
BOTH VOLTAGES ARE OF SUFFICIENT MAGNITUDE 6
/PERATING MODES
4HE CLOSING CHECK PROCEDURE CAN BE SELECTED FROM
THE FOLLOWING FUNCTIONS
39.#(2
2ELEASE AT SYNCHRONISM 4HAT IS
WHEN THE CRITICAL VALUES
5
AND
F LIE WITHIN THE SET LIMITS
5 5 2ELEASE FOR ENERGIZED LINE 5
AND
DE ENERGIZED
BUS BAR
5
5 5 2ELEASE FOR DE ENERGIZED LINE
5 AND ENERGIZED BUS BAR
5
5 5 2ELEASE FOR DE ENERGIZED LINE
5 AND DE ENERGIZED BUS
BAR 5
/6%22)$% 2ELEASE WITHOUT ANY CHECK
4HE RELEASE CONDITIONS CAN BE SET INDIVIDUALLY FOR AU
TOMATIC AND FOR MANUAL CLOSING EG ONE CAN PERMIT
MANUAL CLOSING AT SYNCHRONISM OR DEAD LINE WHILST
BEFORE AN AUTO RECLOSE AT ONE LINE END ONLY FREE
DOM FROM VOLTAGE AND AT THE OTHER END ONLY SYN
CHRONISM WILL BE CHECKED
%ACH OF THESE CONDITIONS CAN BE SWITCHED TO BE EF
FECTIVE OR NOT EFFECTIVE COMBINATIONS ARE ALSO POSSI
BLE EG RELEASE WHEN 5 5 OR 5 5 ARE
SATISFIED #OMBINATION OF /6%22)$% WITH OTHER PA
RAMETERS IS OF COURSE NOT MEANINGFUL