•
Str 3 delay shot 4
Time delay settings for the DEL_INIT_4 signal
•
Str 4 delay shot 1
•
Str 4 delay shot 2
•
Str 4 delay shot 3
•
Str 4 delay shot 4
Normally, only two or three reclosing attempts are made. The third and fourth
attempts are used to provide the so-called fast final trip to lockout.
OR
CB_TRIP
CB_ POSITION
CB_ READY
CB_CLOSE
PHLPT OC
I_A
I_B STAR T
OPERATE
I_C
BLOCK
ENA_ M ULT
DA RR EC
OPEN _CB
CLOSE _CB
CM D_W AIT
INPRO
LOCKED
PROT _CRD
UNSUC_RECL
DEL_ INIT_4
DEL_ INIT_3
DEL_ INIT_2
INIT_6
INIT_5
INIT_4
INIT_3
INIT_2
INIT_1
SYNC
INC_SHOTP
CB_READY
CB_POS
RECL_ON
INHIBIT_ RECL
BLK_RCLM_T
BLK_RECL _T
BLK_THERM
AR_ON
READY
Figure 538: Autoreclosing configuration example
Delayed DEL_INIT_2...4 signals are used only when the autoreclosing shot is
initiated with the start signal of a protection stage. After a start delay, the AR
function opens the circuit breaker and an autoreclosing shot is initiated. When the
shot is initiated with the trip signal of the protection, the protection function trips
the circuit breaker and simultaneously initiates the autoreclosing shot.
If the circuit breaker is manually closed against the fault, that is, if SOTF is used,
the fourth time delay can automatically be taken into use. This is controlled with the
internal logic of the AR function and the
Fourth delay in SOTF
parameter.
A typical autoreclose situation is where one autoreclosing shot has been performed
after the fault was detected. There are two types of such cases: operation initiated
with protection start signal and operation initiated with protection trip signal. In
both cases, the autoreclosing sequence is successful: the reclaim time elapses and
no new sequence is started.
1MRS757644 H
Control functions
620 series
Technical Manual
1017
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