Disconnector
Closed
Both Open
Earthing switch
Closed
Disconnector
Intermediate
Earthing switch
Intermediate
Earthing switch
Close Cmd
Earthing switch
Open Cmd
Earthing switch Open Cmd
Disconnector
Close Cmd
Disconnector
Open Cmd
Disconnector Open Cmd
Figure 832: Control of a three-position switch by commands
9.2.4.3 Blocking
The function has a blocking functionality to prevent human errors that can cause
injuries to the operator and damages to the system components.
The control operations are allowed if the interlocking signals for the operations
are TRUE. These signals are ENA_DCOPEN, ENA_DCCLOSE, ENA_ESOPEN and
ENA_ESCLOSE.
In addition, the function provides a general interlocking bypass input ITL_BYPASS.
When ITL_BYPASS is TRUE, the apparatus can be controlled by discarding the
ENA_DCOPEN, ENA_DCCLOSE, ENA_ESOPEN and ENA_ESCLOSE input states.
However, the BLK_DCOPEN, BLK_DCCLOSE, BLK_ESOPEN and BLK_ESCLOSE input
signals are not bypassed with the interlocking bypass functionality since they
always have higher priority.
In
Table 1477
the interlocking condition is switch-specific by row.
Table 1477: Interlocking conditions for enabling the closing/opening command
Inputs Outputs
ITL_BYPASS ENA_DCCLOSE BLK_DCCLOSE DCCLOSE_ENAD
ENA_DCOPEN BLK_DCOPEN DCOPEN_ENAD
ENA_ESCLOSE BLK_ESCLOSE ESCLOSE_ENAD
ENA_ESOPEN BLK_ESOPEN ESOPEN_ENAD
0 = False 0 = False 0 = False 0 = False
0 = False 0 = False 1 = True 0 = False
0 = False 1 = True 0 = False 1 = True
Table continues on the next page
Control functions 1MRS759142 F
1524 REX640
Technical Manual
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