/PERATING INSTRUCTIONS
3$
6
# ' #
3 , / 0 %
3LOPE OF THE SECOND DECLINED BRANCH OF THE TRIPPING
CHARACTERISTIC
3MALLEST SETTING
,ARGEST SETTING
)NRUSH STABILIZATION WITH THE SECOND HARMONIC IS
/&&
SWITCHED OFF
/.
SWITCHED ON OR
N D
( ! 2 - / .
/ & &
/ .
N D
( ! 2 - / .
ND HARMONIC CONTENT IN DIFFERENTIAL CURRENT WHICH JUST
INITIATES BLOCKING IN OF FUNDAMENTAL WAVE OF THE DIFFER
ENTIAL CURRENT
3MALLEST SETTING
,ARGEST SETTING
3 ! 4
2 % 3 4 2
) ) N , N
3TABILIZING RESTRAINING CURRENT WHICH IS DECISIVE FOR THE
ADDON STABILIZATION REFERRED TO THE RATED LINE CURRENT
ADDRESS
3MALLEST SETTING
|
)
. LINE
,ARGEST SETTING
|
)
. LINE
4HE DIFFERENTIAL PROTECTION CONTAINS A LOCAL CURRENT
THRESHOLD ) 2%,%!3% ADDRESS WHICH PRO
VIDES AN ADDITIONAL TRIP CONDITION !BOVE ALL THE MAX
IMUM CURRENT WHICH IS EXPECTED DURING OPERATIONAL
CONDITIONS IS DECISIVE FOR THIS SETTING 0ICKUP OF THIS
STAGE CAUSED BY SYMMETRICAL OVERLOAD MUST BE EX
CLUDED 4HEREFORE THE VALUE SHOULD BE SET ABOVE THE
MAXIMUM EXPECTED OVER LOAD CURRENT OF THE LINE AT
LEAST TIMES 4HE VALUE IS REFERRED TO THE RATED LINE
CURRENT AS SET UNDER ADDRESS REFER TO 3ECTION
4HIS LOCAL CURRENT THRESHOLD PROVIDES THE EF
FECT THAT THE FAULTY LINE WILL BE SWITCHED OFF ONLY AT THAT
THOSE LINE ENDS WHERE A REASONABLE SHORTCIRCUIT
CURRENT FLOWS )F THE CIRCUIT BREAKER AT A NONFEEDING
LINE END SHOULD ALSO BE TRIPPED THE INTEGRATED INTER
TRIP FACILITY CAN BE USED SEE BELOW ! PRECONDITION
IS THAT THE RELAY IS EQUIPPED WITH THIS FACILITY MODELS
WITH PILOT WIRE MONITOR INTERTRIP AND TRANSFER TRIP
3$
J JJJ
J JJ
&URTHERMORE POSSIBILITY EX
ISTS TO TRIP THE BREAKER WITHOUT RELEASE BY THE LOCAL
CURRENT WHEN THE COMMAND
DIR$IF4RIP
&.O
SEE 3ECTION IS USED FOR TRIPPING
)N SPECIAL CASES IT MAY BE ADVANTAGEOUS TO DELAY THE
TRIP SIGNAL OF THE PROTECTION EG FOR REVERSE INTER
LOCKING &OR THIS AN ADDITIONAL TIME DELAY CAN BE SET
ADDRESS 5NDER NORMAL CIRCUMSTANCES THIS
TIME DELAY IS SET TO ZERO
!DDITIONALLY A DROPOFF DELAY AFTER TRIP CAN BE SET UN
DER ADDRESS 4 2%3%4 4HIS SHOULD ENSURE
THAT THE TRIP COMMAND IS MAINTAINED FOR A SUFFICIENTLY
LONG TIME PERIOD EVEN WHEN THE CIRCUIT BREAKER INTER
RUPTION TIMES ARE DIFFERENT AT THE LINE ENDS
)F A TRIP TIME DELAY HAS BEEN SET IN ADDRESS THEN
NEVERTHELESS INSTANTANEOUS TRIP IS DESIRED IN CASE OF
SWITCHING ONTO A DEAD FAULT EG WHEN AN EARTHING
ISOLATOR HAS HAPPENED TO REMAIN CLOSED !DDRESS
ALLOWS TO PASS A TRIP TIME DELAY BY ! PREREQUI
SITE IS THAT THE MANUAL CLOSE COMMAND FOR THE
BREAKER IS REPEATED VIA A BINARY INPUT TO THE RELAY SO
THAT IT IS INFORMED ABOUT MANUAL CLOSING OF THE
BREAKER
Содержание 7SD502
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