)NTRODUCTION
6+
6
# ' #
)NTRODUCTION
!PPLICATION
4HE NUMERICAL AUTO RECLOSURE RELAY 6+ IS AN
UNIVERSALLY APPLICABLE DEVICE FOR AUTOMATIC RECLOS
URE AS WELL AS CHECKING OF THE CLOSING CONDITIONS OF
CIRCUIT BREAKERS BEFORE AUTOMATIC ANDOR MANUAL
SWITCHING IN ELECTRICAL POWER NETWORKS OF ALL VOLTAGE
RANGES
3INGLE POLE THREE POLE OR SINGLE
AND THREE
POLE RAPID AUTO RECLOSURE IS POSSIBLE FOR OVERHEAD
LINES AS WELL AS MULTIPLE AUTO RECLOSE SEQUENCES
4HE DEAD TIMES DURING WHICH THE LINE IS INTERRUPTED
CAN BE INDIVIDUALLY SET FOR SINGLE POLE AUTO RECLO
SURE THREE POLE AUTO RECLOSURE 2!2 RAPID AU
TO RECLOSURE AND FOR CONSECUTIVE AUTO RECLOSE
CYCLES $!2 DELAYED AUTO RECLOSURE
4HE OPTIONAL SYNCHRONISM AND VOLTAGE CHECK FUNC
TION OF 6+ CAN CHECK THE CONDITIONS FOR RECLOS
ING BEFORE THE RELAY ISSUES THE CLOSE COMMAND 4HIS
FUNCTION CHECKS SYNCHRONISM OF THE BUS BAR AND
LINE VOLTAGE !LTERNATIVELY IT CAN BE USED TO CHECK
THAT THE LINE IS DEAD BEFORE IT IS ENERGIZED OR THAT THE
BUS BAR IS DEAD OR BOTH 7HEN DESIRED ASYNCHRO
NOUS SWITCHING IS POSSIBLE TOO IN THIS CASE THE DE
VICE CALCULATES THE INSTANT OF THE CLOSE COMMAND
SUCH THAT BOTH VOLTAGES HAVE EQUAL PHASE AT THE MO
MENT WHEN THE BREAKER POLES TOUCH
4HE CIRCUIT BREAKER MUST BE SUITABLE FOR AUTO RECLO
SURE 7HEN SINGLE POLE AUTO RECLOSURE IS TO BE
PERFORMED THE BREAKER POLES MUST BE SWITCHED INDI
VIDUALLY 4HE READINESS OF THE BREAKER TO CARRY OUT A
TRIP CLOSE CYCLE IS TAKEN INTO CONSIDERATION AS WELL
AS THE POSITION OF THE BREAKER PROVIDED THESE INFOR
MATIONS ARE AVAILABLE FROM THE CIRCUIT BREAKER 4HE
RECOVERY TIME OF THE BREAKER CAN BE SUPERVISED
7HEN SINGLE POLE AUTO RECLOSURE IS USED THE AUX
ILIARY CONTACTS OF THE BREAKER POLES CAN BE CON
NECTED IN SERIES ALL THREE POLES CLOSED OR IN PARALLEL
EITHER POLE CLOSED OR BOTH CONNECTION CAN BE FED
TO THE DEVICE !LTERNATIVELY THE AUXILIARY CONTACTS OF
THE INDIVIDUAL BEAKER POLES CAN BE CONSIDERED BY
THE DEVICE "UT GENERALLY THE DEVICE CAN OPERATE
WITHOUT SUCH INFORMATIONS FROM THE CIRCUIT BREAKER
6+ CAN OPERATE IN CONJUNCTION WITH CONVENTION
AL STATIC OR NUMERICAL PROTECTION DEVICES )T REQUIRES
STARTING AND TRIPPING SIGNALS FROM THE FEEDER PROTEC
TION 7HEN SINGLE POLE AUTO RECLOSURE IS USED EI
THER DIFFERENT TRIPPING SIGNALS MUST BE AVAILABLE FOR
SINGLE POLE TRIP AND THREE POLE TRIP OR TRIPPING SIG
NALS MUST BE AVAILABLE FOR THE INDIVIDUAL BREAKER
POLES IN ORDER TO ALLOW DISTINCTION TO BE MADE BE
TWEEN INITIATION OF SINGLE POLE AND THREE POLE AU
TO RECLOSURE
/PERATION OF THE AUTO RECLOSE FUNCTION OF 6+ IN
CONJUNCTION WITH AN EXTERNAL SYNCHRONISM CHECK
RELAY IS POSSIBLE AS WELL OPERATION OF THE CHECK SYN
CHRONISM FUNCTION OF 6+ IN CONJUNCTION WITH AN
EXTERNAL AUTO RECLOSE DEVICE &URTHERMORE TWO
PROTECTION DEVICES WITH ONE 6+ OR TWO PROTEC
TION DEVICES WITH TWO AUTO RECLOSE DEVICES CAN BE
USED
4HROUGHOUT A FAULT IN THE NETWORK THE MAGNITUDES OF
THE INSTANTANEOUS VALUES ARE STORED FOR A PERIOD OF
MAX SECONDS SECONDS AT (Z FOR TRANS
MISSION TO A CENTRAL COMPUTER STATION AND ARE AVAIL
ABLE FOR SUBSEQUENT FAULT ANALYSIS
#ONTINUOUS MONITORING OF THE INTERNAL MEASURED VAL
UE PROCESSING CIRCUITS AND MONITORING OF THE AUXILIA
RY VOLTAGES TO ENSURE THAT THEY REMAIN WITHIN TOLER
ANCE ARE OBVIOUSLY INHERENT FEATURES
3ERIAL INTERFACES ALLOW COMPREHENSIVE COMMUNICA
TION WITH OTHER DIGITAL CONTROL AND STORAGE DEVICES
&OR DATA TRANSMISSION A STANDARDIZED PROTOCOL IN AC
CORDANCE WITH $). IS USED 4HE DEVICE CAN
THEREFORE BE INCORPORATED IN ,OCALIZED 3UBSTATION
!UTOMATION NETWORKS ,3!