ABB RELION REX640 Technical Manual page 1373

1MRS759142 C
REX640
Technical Manual
Earthing switch
Closed
Earthing switch
Earthing switch
Intermediate
Close Cmd
Earthing switch Open Cmd
Both Open
Disconnector Open Cmd
Disconnector
Disconnector
Close Cmd
Intermediate
Disconnector
Closed
GUID-B15346CB-D221-4E92-A7A6-E4998CF931B2 V1 EN
Figure 728: Control of a three-position switch by commands
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 1318 the interlocking condition is switch-specific by row.
Table 1318: Interlocking conditions for enabling the closing/opening command
Inputs
ITL_BYPASS ENA_DCCLOSE
ENA_DCOPEN
ENA_ESCLOSE
ENA_ESOPEN
0 = False 0 = False
0 = False 0 = False
0 = False 1 = True
Table continues on next page
Earthing switch
Open Cmd
Disconnector
Open Cmd
BLK_DCCLOSE
BLK_DCOPEN
BLK_ESCLOSE
BLK_ESOPEN
0 = False
1 = True
0 = False
Section 9
Control functions
Outputs
DCCLOSE_ENAD
DCOPEN_ENAD
ESCLOSE_ENAD
ESOPEN_ENAD
0 = False
0 = False
1 = True
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