ABB RER620 Technical Manual page 308

Section 5
Control functions
302
50P-1
I_A TRIP
TripIn_A
TripIn_B
I_B PICKUP
TripIn_C
TripIn_3P
I_C
TripIn_N
BLOCK
Pickupin_A
Pickupin_B
ENA_MULT
Pickupin_C
51P-1
I_A TRIP
I_B PICKUP
TripIn_A
I_C
TripIn_B
TripIn_C
BLOCK
TripIn_3P
TripIn_N
ENA_MULT
Pickupin_A
Pickupin_B
Pickupin_C
51N/G
TRIP
I_N OR I_G
PICKUP
BLOCK
ENA_MULT
Circuit breaker position
information from binary input
Conditions to verify if circuit breaker
is ready to be reclosed
Figure 157: Configuration example of using the
blocking
If the Protection crd limit setting has the value "1", the instantaneous three-phase
overcurrent protection function 50P-3 is disabled or blocked after the first shot.
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 autoreclose 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. An example of a permanent fault is, for example, energizing a power
line into a forgotten grounding 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 autoreclose shot. The energizing of the power line is
detected from the CB_POS information.
SOTF is activated when the AR function is enabled or when the AR function is started and
the SOTF should remain active for the reclaim time.
79
SDAIGGIO1
INIT_x
Active_A INIT_x
Active_B
INIT_x
Active_C
INIT_x
Active_3P
INIT_x
TripOut
INIT_x
DEL_INIT_2
DEL_INIT_3
UNSUC_RECL
DEL_INIT_4
BLK_RECL_T
BLK_RCLM_T
BLK_THERM
SDAIGGIO 2-6
CB_POS
Active_A CB_READY
Active_B
DISA_COUNT
Active_C
INC_SHOTP
Active_3P
INHIBIT_RECL
TripOut
RECL_ON
SYNC
1MAC309294-MB F
OPEN_CB
CLOSE_CB
SDAOGGIO
CMD_WAIT
Active_PhA OpenCb_A
PROT_CRD
Active_PhB CloseCb_A
PROT_DISA Active_PhC Locked_A
Active_Ph3P
INPRO
LOCKED
OpenCb_B
CbPos_a
CloseCb_B
CbPos_b
AR_ON Locked_B
CbPos_c
CbPos_3P OpenCb_C
CloseCb_C
Reclose_in Locked_C
Open_in
OpenCb_3P
Lockout_in
CloseCb_3P
inProgress_in
Locked_3P
Ar_CbPos
output for protection
PROT_CRD
Technical Manual
RER620