ABB RELION REX640 - 9.12.5.4 Transfer initiation; Under frequency initiation

Monitored data STATUS is updated based on the function state. STATUS output can
have following values:
• Ready – sync
- Function is ready for transfer, i.e. READY output is TRUE
- FAST_READY is TRUE (Fast transfer conditions are met)
• Ready – not sync: function is ready
- Function is ready for transfer, i.e. READY output is TRUE
- FAST_READY is FALSE (Fast transfer conditions are not met)
• Not ready – sync
- Function is not ready for transfer, i.e. READY output is FALSE
- FAST_READY is TRUE (Fast transfer conditions are met)
• Not ready – not sync
- Function is not ready for transfer, i.e. READY output is FALSE
- Function is set “off” or TRANSFER_ON is FALSE.
• Off
- Function is set “off” or TRANSFER_ON is FALSE.
9.12.5.4 Transfer initiation
Functionally module can be split to submodules presented in Figure 937 . Each
module is explained later below.
Under
frequency
initiation
Under
voltage
initiation
External
transfer
initiation
Circuit
breaker
open
transfer
initiation
DISA_INIT
INIT_TR_1_2
INIT_TR_2_1
INIT_MANUAL
DISA_1_2
DISA_2_1
DISA_CBOPN
INIT_UF
INIT_UV
INIT_EXT
U_AB_1
(from Voltage monitoring)
U_AB_2
(from Voltage monitoring)
FRQ_MEAS_1
(from Voltage monitoring)
FRQ_MEAS_2
(from Voltage monitoring)
READY
(from Evaluation)
INIT_CBOPN
INIT_MAN
Figure 937: Transfer initiation module diagram
Control functions
1MRS759142 F
1768 REX640
Technical Manual