Siemens 7VK512

-ETHOD OF OPERATION6+
6

#
' #
FOR THE SUPPRESSION OF INTERFERENCE 4HE FILTERS HAVE
BEEN OPTIMIZED WITH REGARD TO BANDWIDTH AND PRO
CESSING SPEED TO SUIT THE MEASURED VALUE PROCESS
ING 4HE MATCHED ANALOG VALUES ARE THEN PASSED TO
THE ANALOG INPUT SECTION !%
4HE ANALOG INPUT SECTION !% CONTAINS INPUT AMPLIFI
ERS SAMPLE AND HOLD ELEMENTS FOR EACH INPUT ANA
LOG
TO DIGITAL CONVERTERS AND MEMORY CIRCUITS FOR
THE DATA TRANSFER TO THE MICROPROCESSOR
!PART FROM CONTROL AND SUPERVISION OF THE MEASURED
VALUES THE MICROPROCESSOR PROCESSES THE ACTUAL AU
TOMATIC FUNCTIONS 4HESE INCLUDE IN PARTICULAR
FILTERING AND FORMATION OF THE INPUT QUANTITIES
COMPARISON OF THE VOLTAGES WITH THE SETTING VALUES
RELEVANT FOR CIRCUIT BREAKER CLOSING \5\ \5\
\5\ F 
SCANNING OF LIMIT VALUES AND TIME SEQUENCES
CONTROL OF SIGNALS AND SEQUENCES FOR MANUAL CLOS
ING AUTOMATIC RECLOSING AND CLOSING CHECKS
DECISION ABOUT CLOSE COMMANDS
STORAGE OF MEASURED QUANTITIES DURING A FAULT FOR
ANALYSIS
"INARY INPUTS AND OUTPUTS TO AND FROM THE PROCESSOR
ARE CHANNELLED VIA THE INPUTOUTPUT ELEMENTS &ROM
THESE THE PROCESSOR RECEIVES INFORMATION FROM THE
SWITCH
GEAR EG READINESS SIGNAL FROM THE CIRCUIT
BREAKER OR FROM OTHER EQUIPMENT EG INITIATION SIG
NAL FROM FEEDER PROTECTION /UTPUTS INCLUDE IN PAR
TICULAR CLOSE COMMANDS TO THE CIRCUIT BREAKER SIG
NALS FOR REMOTE SIGNALLING OF IMPORTANT EVENTS AND
CONDITIONS AS WELL AS VISUAL INDICATORS ,%$S AND
AN ALPHANUMERICAL DISPLAY ON THE FRONT
!N INTEGRATED MEMBRANE KEYBOARD IN CONNECTION
WITH A BUILT
IN ALPHANUMERICAL ,#$ DISPLAY ENABLES
COMMUNICATION WITH THE UNIT !LL OPERATIONAL DATA
SUCH AS SETTING VALUES PLANT DATA ETC ARE ENTERED
INTO THE DEVICE FROM THIS PANEL REFER TO 3ECTION 
5SING THIS PANEL THE PARAMETERS CAN BE RECALLED AND
THE RELEVANT DATA FOR THE EVALUATION OF A FAULT CAN BE
READ OUT AFTER A FAULT HAS OCCURRED REFER TO 3ECTION
 4HE DIALOG WITH THE RELAY CAN BE CARRIED OUT AL
TERNATIVELY VIA THE SERIAL INTERFACE IN THE FRONT PLATE BY
MEANS OF AN OPERATOR PANEL OR A PERSONAL COMPUTER
6IA A SECOND SERIAL INTERFACE OPTIONAL FAULT DATA
CAN BE TRANSMITTED TO A CENTRAL EVALUATION UNIT $UR
ING HEALTHY OPERATION MEASURED VALUES CAN ALSO BE
TRANSMITTED EG THE MEASURED VOLTAGES OF BUS
BAR
AND FEEDER 4HIS SECOND INTERFACE IS SUITABLE FOR CON
NECTION OF OPTICAL FIBRE LINKS
! POWER SUPPLY UNIT PROVIDES THE AUXILIARY SUPPLY ON
THE VARIOUS VOLTAGE LEVELS TO THE DESCRIBED FUNCTIONAL
UNITS  6 IS USED FOR THE RELAY OUTPUTS 4HE ANA
LOG INPUT REQUIRES q 6 WHEREAS THE PROCESSOR AND
ITS IMMEDIATE PERIPHERALS ARE SUPPLIED WITH  6
4RANSIENT FAILURES IN THE SUPPLY VOLTAGE UP TO  MS
WHICH MAY OCCUR DURING SHORT
CIRCUITS IN THE DC
SUPPLY SYSTEM OF THE PLANT ARE BRIDGED BY A DC VOLT
AGE STORAGE ELEMENT RATED AUXILIARY VOLTAGE

 6DC