-ETHOD OF OPERATION3*
6
#
' #
42)0 350
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42)0 350%26
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7)4( ")
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&AILURE 4#
350 -ARSH&AIL
350 OFF
350 TRIP REL
350 #" AUX
&.O
&.O
RANGIERT
RANGIERT
&.O
&IGURE ,OGIC DIAGRAM OF TRIP CIRCUIT SUPERVISION
$ISTANCE TO FAULT LOCATION
$ISTANCE TO FAULT MEASUREMENT BEFORE CLEARANCE
OF THE FAULT IS AN IMPORTANT ADDITION TO THE FUNCTION OF
A LINE PROTECTION RELAY !VAILABILITY OF THE LINE FOR ENER
GY TRANSMISSION IN THE NETWORK CAN BE INCREASED BY
RAPID LOCATION OF POINT OF FAULT AND REPAIR OF ANY RESUL
TANT DAMAGE
.ORMALLY THE FAULT LOCATION FUNCTION IS STARTED BY THE
TRIPPING COMMAND FROM THE OVERCURRENT TIME PROTEC
TION !T FIRST THE FAULT LOCATOR DETERMINES THE VALID
MEASUREMENT LOOP AND THE MOST FAVOURABLE TIME IN
TERVAL FOR MEASURED VALUE STORAGE 0AIRED VALUES OF
SHORT CIRCUIT CURRENT AND SHORT CIRCUIT VOLTAGE TAKEN
AT INTERVALS OF OF A CYCLE AND STORED IN A CIRCULAT
ING BUFFER ARE FROZEN MS LATER WHICH EVEN WITH EX
TREMELY FAST CIRCUIT BREAKERS ENSURES THAT THE MEA
SUREMENTS ARE NOT DISTORTED BY THE TRIPPING TRAN
SIENTS &ILTERING OF THE MEASURED VALUES AND QUANTITY
OF THE IMPEDANCE CALCULATIONS ARE AUTOMATICALLY
MATCHED TO THE NUMBER OF INCOMING VALUE PAIRS FROM
THE TIME OF FAULT INCEPTION TO MS AFTER TRIPPING
COMMAND
&AULT LOCATION CAN ALSO BE INITIATED VIA A BINARY INPUT
4HE OVERCURRENT TIME PROTECTION MUST HAVE PICKED
UP IN THIS CASE 4HUS CALCULATION IS POSSIBLE WHEN A
DIFFERENT PROTECTION DEVICE EFFECTS CLEARANCE OF A
SHORT CIRCUIT &URTHER FAULT CALCULATION CAN BE STARTED
WITHOUT RECEIPT OF ANY TRIPPING COMMAND IE BY
PICK
UP OF THE OVERCURRENT TIME PROTECTION SELECT
ABLE
ONLY FOR MODEL 3*J JJJJ JJJJ
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