• "always": the
PROT_CRD
output is constantly active
OR
CB_TRIP
CB_PO SITION
CB_READY
CB_CLOSE
DARREC
OPEN_CB
CLOSE_CB
CMD_WAIT
PROT_CRD
INPRO
LO CKED
UNSUC_RECL
PROT_DISA
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_PO S
RECL_ON
INHIBI T_RECL
BLK_RCLM_T
BLK_RECL_T
BLK_THERM
DISA_COUNT
AR_ON
PHLPTOC
I_A
I_B
START
OPERATE
I_C
BLOCK
ENA_MULT
Figure 337: Configuration example of using the PROT_CRD output for protection
blocking
If the
Protection crd limit setting has the value "1", the instantaneous three-phase
overcurrent protection function PHIPTOC is disabled or blocked after the first shot.
9.4.4.7
Circuit breaker controller
Circuit breaker controller contains two features: SOTF and frequent-operation
counter. SOTF protects the AR function in permanent faults.
The circuit breaker position information is controlled with the
CB closed Pos status
setting. The setting value "TRUE” means that when the circuit breaker is closed, the
CB_POS
input is TRUE. When the setting value is “FALSE”, the
CB_POS
input is FALSE,
provided that the circuit breaker is closed. The reclose command pulse time can
be controlled with the
Close pulse time setting: the
CLOSE_CB
output is active for
the time set with the
Close pulse time setting. The
CLOSE_CB
output is deactivated
also when the circuit breaker is detected to be closed, that is, when the
CB_POS
input changes from open state to closed state. The
Wait close time setting defines
the time after the
CLOSE_CB
command activation, during which the circuit breaker
should be closed. If the closing of circuit breaker does not happen during this time,
the autoreclosing function is driven to lockout or, if allowed, an auto-initiation is
activated.
The main motivation for autoreclosing to begin with is the assumption that the fault
is temporary by nature, and that a momentary de-energizing of the power line and
an automatic reclosing restores the power supply. However, when the power line
is manually energized and an immediate protection trip is detected, it is very likely
that the fault is of a permanent type. A permanent fault is, for example, energizing a
power line into a forgotten earthing after a maintenance work along the power line.
In such cases, SOTF is activated, but only for the reclaim time after energizing the
power line and only when the circuit breaker is closed manually and not by the AR
function.
SOTF disables any initiation of an autoreclosing shot. The energizing of the power
line is detected from the
CB_POS
information.
Control functions
1MRS758755 C
670
REC615 & RER615
Technical Manual
