Siemens 7VK512

-ETHOD OF OPERATION6+
6
#
' #

4HE EVENTS CAN ALSO BE READ OUT WITH A PERSONAL
COMPUTER BY MEANS OF THE APPROPRIATE PROGRAM
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 4HIS PROVIDES THE COMFORT OF A #24 SCREEN
AND MENU
GUIDED OPERATION !DDITIONALLY THE DATA
CAN BE DOCUMENTED ON A PRINTER OR STORED ON A
FLOPPY DISC FOR EVALUATION ELSEWHERE
4HE DEVICE STORES THE DATA OF THE LAST THREE NETWORK
FAULTS IF A FOURTH FAULT OCCURS THE OLDEST FAULT IS OVER
WRITTEN IN THE FAULT MEMORY
! NETWORK FAULT BEGINS WITH RECOGNITION OF THE FAULT BY
PICK
UP OF THE FEEDER PROTECTION AND ENDS WITH
DROP
OFF OR EXPIRY OF THE AUTO RECLOSE SEQUENCE SO
THAT NON
SUCCESSFUL AUTO RECLOSE ATTEMPTS WILL
ALSO BE STORED AS PART OF ONE NETWORK FAULT 4HUS
ONE NETWORK FAULT CAN INCLUDE DIFFERENT FAULT EVENTS
FROM PICK
UP UNTIL DROP OFF 4HIS IS PARTICULARLY
ADVANTAGEOUS FOR ALLOCATION OF TIME DATA
 )NFORMATION TO A CENTRAL UNIT OPTIONAL
)N ADDITION ALL STORED INFORMATION CAN BE TRANSMITTED
VIA AN OPTICAL FIBRE CONNECTOR TO A CONTROL CENTRE FOR
EXAMPLE THE 3)%-%.3 ,OCALIZED 3UBSTATION !UTO
MATION 3YSTEM ,3!  4RANSMISSION USES A STAN
DARDIZED TRANSMISSION PROTOCOL ACCORDING TO $).

 $ATA STORAGE AND TRANSMISSION
FOR FAULT RECORDING MODELS WITH
SYNCHRONISM CHECK
4HE INSTANTANEOUS VALUES OF THE MEASURED VALUES
U AND U
ARE SAMPLED AT  MS INTERVALS FOR  (Z AND STORED
IN A CIRCULATING SHIFT REGISTER )N CASE OF A FAULT THE
DATA FROM  CYCLES BEFORE PICK
UP OF THE FEEDER PRO
TECTION UP UNTIL  CYCLES AFTER THE TRIP COMMAND ARE
STORED MAX OVER  SECONDS 4HESE DATA ARE THEN
AVAILABLE FOR FAULT ANALYSIS &OR EACH RENEWED NET
WORK FAULT THE ACTUAL NEW FAULT DATA ARE STORED WITH
OUT ACKNOWLEDGEMENT OF THE OLD DATA
4HE DATA CAN BE TRANSFERRED TO A CONNECTED PERSONAL
COMPUTER VIA THE OPERATION INTERFACE AT THE FRONT AND
EVALUATED BY THE PROTECTION DATA EVALUATION PROGRAM
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 4HE VOLTAGES ARE REFERRED TO THEIR MAXIMUM
VALUES NORMALIZED TO THEIR RATED VALUES AND PRE
PARED FOR GRAPHIC VISUALIZATION )N ADDITION THE SIG
NALS
0ICK UP  4RIP AND $ROP OFF ARE MARKED
ON THE FAULT RECORD
!LTERNATIVELY THE FAULT RECORD DATA CAN BE TRANS
MITTED TO A CONTROL CENTRE VIA THE SERIAL INTERFACE )N
THIS CASE DATA ARE STORED FROM  PERIODS BEFORE TO 
PERIODS AFTER PICK
UP OF THE DEVICE %VALUATION OF
THE DATA IS MADE IN THE CONTROL CENTRE USING APPRO
PRIATE SOFTWARE PROGRAMS 4HE ARE REFERRED TO THEIR
MAXIMUM VALUES NORMALIZED TO THEIR RATED VALUES
AND PREPARED FOR GRAPHIC VISUALIZATION )N ADDITION
THE SIGNALS
0ICK UP  4RIP AND $ROP OFF ARE
MARKED ON THE FAULT RECORD
7HEN THE DATA ARE TRANSFERRED TO A CENTRAL UNIT
READ
OUT CAN PROCEED AUTOMATICALLY OPTIONALLY AF
TER EACH PICK
UP OF THE RELAY OR AFTER AN INSTANTA
NEOUS TRIP 4HE FOLLOWING THEN APPLIES
4HE RELAY SIGNALS THE AVAILABILITY OF FAULT RECORD
DATA
4HE DATA REMAIN AVAILABLE FOR RECALL UNTIL COM
MENCEMENT OF THE NEXT FAULT EVENT
! TRANSMISSION IN PROGRESS CAN BE ABORTED BY THE
CENTRAL UNIT
 /PERATING MEASUREMENTS AND
CONVERSION MODELS WITH SYNCHRO
NISM CHECK
&OR LOCAL RECALL OR TRANSMISSION OF DATA THE TRUE RMS
VALUES OF THE VOLTAGES IN PRIMARY AND SECONDARY VAL
UES THE FREQUENCIES THE VOLTAGE MAGNITUDE DIFFER
ENCE 5 THE FREQUENCY DIFFERENCE F AND THE PHASE
ANGLE DIFFERENCE  ARE ALWAYS AVAILABLE AS LONG AS
THE VOLTAGES ARE PRESENT
4HE FOLLOWING IS VALID
5 THE FEEDER VOLTAGE IN VOLTS SECONDARY
5 THE BUS BAR VOLTAGE IN VOLTS SECONDARY
5
PRI
THE FEEDER VOLTAGE IN KILOVOLTS PRIMARY
5
PRI
THE BUS BAR VOLTAGE IN KILOVOLTS PRIMARY
F THE FREQUENCY OF THE FEEDER VOLTAGE IN
(ERTZ
F THE FREQUENCY OF THE BUS BAR VOLTAGE IN
(ERTZ