GE LPS-D, Instruction Manual

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LPS-D Line Protection System GE Power Management
13.4 CREATING XPRESSION BUILDER LOGIC 13 XPRESSION BUILDER
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13.4.2 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 com-
mand 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).
13.4.3 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 (BPLTRIP), the external configurable input (CNFDI1), the internal block supervision cur-
rent flag (IB), the Boolean operators (OR, AND, and P/D Timer), and the output contact (A1).
Figure 13–11: SAMPLE BREAKER FAILURE LOGIC