When residual voltage transfer is completed, this is indicated with COMPL_RES
output.
Residual voltage transfer can be disabled with DISA_RES input.
Time delayed transfer
The time delayed transfer takes place when
Transfer delay time
elapses. Following
conditions must be met for time delayed transfer:
• transfer is running
• both breakers are open
• DISA_TDLY is FALSE
• setting
Ena Time delay transfer
allows transfer
• if transfer is initiated manually, then ENA_FASTONLY must be FALSE
If DISA_RUN input is active, transfer is not allowed to complete until input is
deactivated.
Time delayed transfer can be enabled with a setting
Ena Time delay transfer
. When
time delayed transfer is completed, this is indicated with COMPL_TDLY output.
Time delayed transfer can be disabled with DISA_TDLY input.
Decoupling
Decoupling is a configurable safety feature. In case during transfer both controllable
breakers end up closed or breaker position is unknown after transfer, last closed
breaker can be set to be reopened. Opening time can be configured with
Decoupling
delay
setting. If decoupling is activated, this is indicated with CB_DECOUPL output.
Decoupling functionality can be enabled with setting
Enable decoupling
.
Enable decoupling
has following modes:
• “Off”, decoupling functionality disabled
• “CB man close”, decoupling is done when both connected breakers closed. Note
that this mode does not require active transfer for the decoupling.
• “Transfer based”, decoupling is done during transfer incase both controllable
breakers end up closed after transfer
• “Both”, both operation modes are in use
Decoupling functionality can be disabled with DISA_DECOUPL input.
If decoupling is activated, function is set to lockout state and this is indicated with
LOCKOUT output. Lockout state can be reset via RST_LKOUT input.
Command
Circuit breaker opening and closing is handled by this module based on the inputs
from transfer modes.
If feeder 2 is the standby feeder, then OPEN_CB1 is activated if:
• transfer is allowed from feeder 1 to feeder 2
• transfer is not started by CB open transfer
• transfer is running, i.e. one of more transfers are active
CLOSE_CB2 is activated if:
• transfer is allowed from feeder 1 to feeder 2
• transfer is completed, this is indicated with following signals:
Control functions
1MRS759142 F
1780 REX640
Technical Manual
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