ABB RELION REX640 - Page 1771

ENA_FASTONLY
DISA_1_2
DISA_2_1
DISA_FAST
DISA_TDLY
DISA_RES
DISA_1ST_PH
DISA_FBBM
COMPL_FAST
COMPL_FBBM
COMPL_1ST_PH
COMPL_RES
COMPL_TDLY
OPEN_CB1
CLOSE_CB1
OPEN_CB2
CLOSE_CB2
TR_RUNNING
DISA_DECOUPL
DISA_RUN
Transfer
sequence
Running
evaluation
Command
TR_1_2_OK
(from Transfer direction)
TR_2_1_OK
(from Transfer direction)
READY
(from Evaluation)
TR_CANCEL
NOT_IDLE
INIT_UF
(from Transfer initiation)
INIT_UV
(from Transfer initiation)
INIT_EXT
(from Transfer initiation)
INIT_MAN
(from Transfer initiation)
CB_DECOUPL
FAST_READY
(from Evaluation)
Figure 938: Bus transfer module diagram
Function supports following transfer modes:
• Fast transfer
- simultaneous control of both involved circuit breakers (fastest mode)
- sequential control of both involved circuit breakers
• Transfer at the 1
st
phase coincidence
• Residual voltage transfer
• Time-delayed transfer
Both fast transfer modes, simultaneous and sequential, are optimum transfer
modes for ensuring only a minimum interruption of the voltage supply in case
of faults in external network. If the network status does not permit fast transfer,
slower transfer modes are selected.
Figure 939 shows the typical decay characteristic (voltage and frequency) of a
disconnected busbar and the possible closing moments.
1MRS759142 F
Control functions
REX640
Technical Manual
1771