ABB RELION SMU615 Applications Manual page 61

1MRS758580 C
3.4.3.4 Functional diagrams for control
DCSXSWI1 and ESSXSWI1 are of status only type. By default, the status only blocks
are connected in the application configuration. The disconnector (CB truck) and line
side earthing switch status information is connected to DCSXSWI1 and ESSXSWI1.
The circuit breaker closing is enabled when the ENA_CLOSE input is activated. The
input can be activated by the configuration logic, which is a combination of the
disconnector or breaker truck and earthing switch position statuses and the status
of the trip logics. The circuit breaker opening command is given via communication
by activating the AU_OPEN input. The circuit breaker closing command is given via
communication by activating the AU_CLOSE input. The circuit breaker opening or
closing command is blocked once the BLK_OPEN or BLK_CLOSE input has been
activated by the Control_OFF signal. By default, Control_OFF is connected to X110-
BI6.
The OKPOS output from DCSXSWI defines if the disconnector or breaker truck is
definitely either open (in test position) or closed (in service position). This output,
together with the earthing switch opening and non-active trip signals, activates
the close-enabling signal to the circuit breaker control function block. The opening
operation for circuit breaker is always enabled.
SMU615
Application Manual
Merging unit variants
61