ABB RER620, Technical Manual

Page: 308 / 584

Section 5
1MAC309294-MB F
Control functions
302 RER620
Technical Manual
Figure 157: 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 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.
CB_TRIP
CB_CLOSE
50P-1
TRIP
PICKUP
ENA_MULT
BLOCK
I_C
I_B
I_A
ENA_MULT
BLOCK
I_C
I_B
I_A TRIP
PICKUP
51P-1
51N/G
ENA_MULT
BLOCK
I_N OR I_G
TRIP
PICKUP
Circuit breaker position
information from binary input
Conditions to verify if circuit breaker
is ready to be reclosed
SDAIGGIO1
Active_A
Active_B
Active_C
Active_3P
TripOut
TripIn_A
TripIn_B
TripIn_C
TripIn_3P
TripIn_N
Pickupin_A
Pickupin_B
Pickupin_C
SDAIGGIO 2-6
Active_A
Active_B
Active_C
Active_3P
TripOut
TripIn_A
TripIn_B
TripIn_C
TripIn_3P
TripIn_N
Pickupin_A
Pickupin_B
Pickupin_C
79
INIT_x
INIT_x
INIT_x
INIT_x
INIT_x
INIT_x
DEL_INIT_2
DEL_INIT_3
DEL_INIT_4
BLK_RECL_T
BLK_RCLM_T
BLK_THERM
CB_POS
CB_READY
DISA_COUNT
INC_SHOTP
INHIBIT_RECL
RECL_ON
SYNC
OPEN_CB
CLOSE_CB
CMD_WAIT
PROT_CRD
PROT_DISA
INPRO
LOCKED
UNSUC_RECL
AR_ON
SDAOGGIO
OpenCb_A
CloseCb_A
Locked_A
OpenCb_B
CloseCb_B
Locked_B
CloseCb_C
Locked_C
OpenCb_3P
CloseCb_3P
Locked_3P
OpenCb_C
Ar_CbPos
Active_PhA
Active_PhB
Active_PhC
Active_Ph3P
CbPos_a
CbPos_b
CbPos_c
CbPos_3P
Reclose_in
Open_in
Lockout_in
inProgress_in