GE Power Management
ALPS Advanced Line Protection System
13-11
13 XPRESSION BUILDER
13.3 CREATING XPRESSION BUILDER LOGIC
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13.3.2 COMPILING AND DOWNLOADING XPRESSION BUILDER LOGIC
Once the logic has been created you are ready to compile. Under the File header, select Compile. If you are connected to
the relay at the time you can download the logic to the relay by selecting the Download command under the File header.
After you compile the logic, under the File header, select Save_As and give the file a name with a .BIN extension. The BIN
file is a binary formatted file which is downloaded to the relay. A user should also save the logic with an .EXP extension.
The EXP file saves the graphical layout of the logic. When both formats are saved, the logic uploaded from the relay can be
matched to the graphical layout saved for the configurable logic file (Note: when Xpression Builder is launched, it prompts
the user for the location of the EXP file; if the EXP file was not created, select Cancel and Xpression Builder will give the
relay logic a graphical layout which is logically correct, but may have a poor layout).
13.3.3 BREAKER FAILURE EXAMPLE
The figure below is an example of a simple breaker failure scheme which can be implemented in the relay using Xpression
Builder logic. Use the description in the previous sections to select the external contact input to block pilot tripping (BPL-
TRIP), the external configurable input (CNFDI1), the internal block supervision current flag (IB), the Boolean operators
(OR, AND, and P/D Timer), and the output contact (A1).
Figure 13–11: SAMPLE BREAKER FAILURE LOGIC
