Siemens 7VK512

-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 IE 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)$%  2ELEASE WITHOUT ANY CHECK
4HE RELEASE CONDITIONS CAN BE SET INDIVIDUALLY FOR AU
TOMATIC AND FOR MANUAL CLOSING EG ONE CAN PERMIT
MANUAL CLOSING AT SYNCHRONISM OR DEAD LINE WHILST
BEFORE AN AUTO
RECLOSE AT ONE LINE END ONLY FREE
DOM FROM VOLTAGE AND AT THE OTHER END ONLY SYN
CHRONISM WILL BE CHECKED
%ACH OF THESE CONDITIONS CAN BE SWITCHED TO BE EF
FECTIVE OR NOT EFFECTIVE COMBINATIONS ARE ALSO POSSI
BLE EG RELEASE WHEN 5 5 OR 5 5 ARE
SATISFIED #OMBINATION OF /6%22)$% WITH OTHER PA
RAMETERS IS OF COURSE NOT MEANINGFUL