Siemens siprotec 7SA6 User Manual page 452

Functions
6-270
In most cases it is sufficient to furnish the status of the circuit breaker with its auxiliary
contacts via a binary input to the device. This always applies if the circuit breaker is
only switched three-pole. Then the NO auxiliary contact of the circuit breaker is
connected to a binary input which must be configured to the input function "!&% S
&ORVHG" (FNo.  ). The other inputs are then not used and the logic is restricted in
principle to simply passing of this input information on.
If the circuit breaker poles can be switched individually, and only the series-connected
NC contacts is available, the relevant binary input (BI) is again allocated to the function
"!&% S 2SHQ" (FNo. ). The remaining inputs are again not used in this case.
If the circuit breaker poles can be switched individually, and the individual auxiliary
contacts are available, an individual binary input should be used for each auxiliary
contact if this is possible and if the device can and should trip single-pole. With this
configuration, the device can process the maximum amount of information. Three
binary inputs are used for this purpose:
− "!&% $X[ /" (FNo. ), for the auxiliary contact of pole L1,
− "!&% $X[ /" (FNo. ), for the auxiliary contact of pole L2,
− "!&% $X[ /" (FNo. ), for the auxiliary contact of pole L3,
The inputs FNo.  and FNo.  are not used in this case.
If the circuit breaker can be switched individually, two binary inputs are sufficient if both
the series-connected NO contacts and the series-connected NC contacts of the
auxiliary contacts of the three poles are available. In this case, series circuit of the NO
contacts is routed to the input function "!&% S &ORVHG" (FNo.  ) and the series
connection of the NC contacts is routed to the input function "!&% S 2SHQ" (FNo.
).
Please note that Figure 6-141 shows the complete logic for all connection alternatives.
For each particular application, only a portion of the inputs is used as described above.
The 8 output signals of the circuit breaker position logic can be processed by the
individual protection and supplementary functions. The output signals are blocked if
the signals provided by the circuit breaker are not plausible e.g. the circuit breaker can
not be open and closed simultaneously. Furthermore, the detection of current flow has
priority to the circuit breaker open detection via auxiliary contacts.
Special binary inputs are available for the auto-reclosure function and for the circuit
breaker check; they are to be handled in the same way and additionally allocated if
necessary. These inputs have an analogueous meaning to the inputs described above
and are identified with "/6 ..." for easy distinction:
− "!&% S &ORVHG" (FNo. ) for the series connection of the NO auxiliary
contacts of the CB
− "!&% S 2SHQ" (FNo. ) for the series connection of the NC auxiliary
contacts of the CB
− "!&% 3ROH /" (FNo. ) for the auxiliary contact of pole L1
− "!&% 3ROH /" (FNo. ) for the auxiliary contact of pole L2
− "!&% 3ROH /" (FNo. ) for the auxiliary contact of pole L3
7SA6 Manual
C53000-G1176-C133-1