BLOCK input activation resets all outputs.
Lockout handling
Function can be set to lockout state by activation of ACT_LKOUT input. When
function is in lockout, this is shown with LOCKOUT output. Lockout state can be
reset with RST_LKOUT input or via clear menu parameter
HSABTC reset lockout
.
Lockout state can be activated also when circuit breaker decoupling, CB_DECOUPL,
activates.
Fast transfer evaluation
This module evaluates fast transfer readiness. Fast transfer is allowed if following
conditions are met:
• U_STDBY_FAIL is FALSE
Stand-by feeder voltage is greater than setting
Min standby voltage
• U_BB_FAIL is FALSE
Busbar voltage is greater than setting
Min busbar voltage
• FRQ_DIFF_FAIL is FALSE
Frequency difference between standby feeder and busbar is less than setting
Max frequency Diff
• ANG_DIFF_FAIL is FALSE
Phase angle difference is inside sector defined by
Maximum phase lead
and
Maximum phase lag
• GRAD_FAIL is FALSE
Frequency rate of change in busbar is less than setting
Max DfDt
• BLOCK input is FALSE
• TRANSFER_ON input is TRUE
• DISA_INIT input is FALSE
• LOCKOUT is FALSE (Function is not in lockout)
• Transfer is allowed to one direction, i.e. TR_1_2_OK or TR_2_1_OK is true
If all conditions are met, then the information is signaled to Bus transfer with
FAST_READY signal.
Transfer evaluation
This module evaluates the transfer enable signal. The READY output is active if
following conditions are fulfilled:
• U_STDBY_FAIL is FALSE
Stand-by feeder voltage is greater than setting
Min standby voltage
• BLOCK input is FALSE
• TRANSFER_ON input is TRUE
• DISA_INIT input is FALSE
• LOCKOUT is FALSE
• Transfer is allowed to one direction, i.e. TR_1_2_OK or TR_2_1_OK is true
When function is ready for transfer, this is shown with output READY. If transfer
initiation is not possible, then NOT_READY output is activated.
1MRS759142 F
Control functions
REX640
Technical Manual
1767
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