Siemens 7VK512

-ETHOD OF OPERATION6+
6
#
' #

 !UTOMATIC RECLOSURE
 'ENERAL
%XPERIENCE HAS SHOWN THAT APPROXIMATELY   OF
SHORT CIRCUITS ARE CAUSED BY AN ARC ON OVERHEAD
LINES AND SELF
EXTINGUISH AFTER INTERRUPTION BY THE
PROTECTIVE DEVICE 4HE LINE CAN THEREFORE BE RE
EN
ERGIZED 4HIS IS CARRIED OUT BY THE AUTOMATIC RECLO
SURE !2 FUNCTION &IGURE  SHOWS AN EXAMPLE FOR
THE TIME SEQUENCE OF A TWO
SHOT AUTO RECLOSURE
WITH A 2!2 CYCLE FOLLOWED BY A $!2 CYCLE
)F THE CIRCUIT BREAKER POLES CAN BE TRIPPED INDIVIDUAL
LY THEN !2 IS OFTEN CARRIED OUT SINGLE
POLE FOR SING
LE
PHASE FAULTS AND THREE POLE FOR MULTI PHASE
FAULTS IN NETWORKS WITH EARTHED STARPOINT )F THE SHORT
CIRCUIT IS STILL PRESENT AFTER THE AUTO
RECLOSURE ARC
NOT QUENCHED OR METALLIC SHORT CIRCUIT THEN THE PRO
TECTIVE RELAY FINALLY DISCONNECTS THE POWER -ULTIPLE
AUTO
RECLOSURE ATTEMPTS OFTEN WITH A FIRST RAPID
AUTO
RECLOSURE 2!2 AND SUBSEQUENT DELAYED
AUTO
RECLOSE CYCLES $!2 ARE POSSIBLE IN SOME
NETWORKS
6+ ALLOWS AUTOMATIC THREE
POLE SINGLE POLE
SINGLE
AND THREE POLE AS WELL AS SINGLE AND MUL
TI
SHOT RECLOSURE 7ITH MULTI SHOT AUTO RECLOSURE
THE FIRST SHOT IS DESIGNATED WITH 2!2 RAPID AUTO
RE
CLOSURE AND THE SUBSEQUENT SHOTS ARE DESIGNATED
WITH $!2 DELAYED AUTO
RECLOSURE INDEPENDENT ON
THE REAL SETTING OF THE DEAD TIMES OF THE AUTO
RE
CLOSE CYCLES
)N ORDER TO PERFORM SINGLE
POLE OR SINGLE AND
THREE
POLE AUTO RECLOSURE IT IS NECESSARY THAT THE
FEEDER PROTECTION IS ABLE TO ISSUE PHASE SEGREGATED
TRIP COMMANDS
3IGNAL EXCHANGE BETWEEN THE FEEDER PROTECTION AND
THE 6+ AUTO
RECLOSE UNIT MUST BE ACCOM
PLISHED VIA THE BINARY INPUTS AND OUTPUTS OF THE UNIT
&URTHERMORE IT IS ALSO POSSIBLE TO ALLOW THE 6+
TO BE TRIGGERED FROM MORE THAN ONE PROTECTION RELAYS
EG MAIN PROTECTION AND ALTERNATE PROTECTION SEE
3ECTION  )N THIS CASE 6+ CAN PERFORM
THREE
POLE COUPLING FOR BOTH FEEDER PROTECTION RE
LAYS IF ONLY ONE RELAY TRIPS MULTI
POLE OR IF THE PROTEC
TION RELAYS MAKE ATTEMPT TO TRIP SINGLE
POLE IN DIFFER
ENT PHASES
4HE USE OF TWO 6+ RELAYS WITH TWO FEEDER PRO
TECTION RELAYS IS ALSO POSSIBLE AS WELL AS THE USE OF
ONE 6+ WITH A FEEDER PROTECTION AND A SECOND
AUTO
RECLOSE RELAY WITH SEPARATE FEEDER PROTECTION
EXAMPLE SEE 3ECTION 
4HE POSSIBLE PROGRAMS OF THE !2
FUNCTION FOR THE
FIRST !2
CYCLE DESIGNATED IN THE FOLLOWING WITH 2!2
RAPID AUTO RECLOSURE ARE
2!2 02/'  4(2%% 0/,% IE ALL TYPES OF
FAULTS RESULT IN THREE
POLE !2
2!2 02/'  3).',% 0/,% IE SINGLE
PHASE FAULTS RESULT IN SINGLE
POLE !2 MULTI PHASE FAULTS IN
THREE
POLE FINAL DISCONNECTION
2!2 02/'  3).',%4(2%% 0/,E IE
SINGLE
PHASE FAULTS RESULT IN
SINGLE
POLE !2 MULTI PHASE
FAULTS IN THREE
POLE !2
)F MORE THAN ONE RECLOSE ATTEMPT WILL BE CARRIED OUT
THE SECOND AND ANY FURTHER AUTO
RECLOSE CYCLE ARE
DESIGNATED IN THE FOLLOWING WITH $!2 DELAYED
AUTO
RECLOSURE INDEPENDENT ON THE SETTING OF THE
DEAD TIMES OF THE CYCLES )T IS POSSIBLE TO SKIP THE
2!2 CYCLE SO THAT ONLY $!2 CYCLES OCCUR $!2
CYCLES ARE ALWAYS THREE
POLE &OR THE $!2 FUNC
TION THE FOLLOWING PROGRAMS ARE SELECTABLE
$!2 02/'  ./ $!2 IE NO $!2 OCCURS UN
SUCCESSFUL 2!2 RESULTS IN FINAL
TRIP
$!2 02/'  $!2 7)4(/54 2!2 IE $!2
CYCLES CAN BE CARRIED OUT EVEN
WITHOUT A PRECEDING 2!2 CYCLE
EG 2!2 IS BY
PASSED BE
CAUSE BLOCKED
$!2 02/'  $!2 !&4%2 2!2 IE THE $!2
CYCLES CAN ONLY BE INITIATED AFTER
AN UNSUCCESSFUL 2!2
0REREQUISITE FOR INITIATION OF THE !2
FUNCTION IS AL
WAYS THAT THE CIRCUIT BREAKER IS READY FOR OPERATION
WHEN PICK
UP OCCURS 4HIS INFORMATION IS TRANS
MITTED TO THE DEVICE VIA A BINARY INPUT
&URTHERMORE RECLOSURE IS BLOCKED IF THE TRIPPING
COMMAND OCCURS AFTER THE ACTION TIME WHICH CAN BE
SET INDIVIDUALLY FOR 2!2 AND $!2