72A-2543-01 Rev. C 01/07
D-1
Appendix D. Global Positioning System
The receiver and antenna available for the F6150 / F6150A are useful for end-to-end testing, where two
instruments must be precisely synchronized in order to simulate a power system fault accurately. Each
instrument synchronizes its internal clock with the one pulse per second signal transmitted by satellites
in the Global Positioning System (GPS). This setup allows multiple F6150s to synchronize to a
common reference signal without the need for networking.
GPS Synchronization
End-to-end testing of a protection scheme requires that two F6150 / F6150A Instruments not connected
to the same network be precisely synchronized. Two F6150 / F6150A Instruments inject the same fault
at each end of the line at the same moment. When an actual fault occurs, the relay at the near end and
the relay at the far end of the line both detect the fault simultaneously. In this situation, the only way to
simulate what each relay sees is to apply the fault to each relay at exactly the same time.
End-to-end testing using GPS synchronization permits evaluation of a complete protection scheme. The
test evaluates the performance of the system’s protective relays and its communication equipment.
Figure D.1 gives an overview of all the components required to conduct an end-to-end test using GPS
synchronization.
Summary of Contents for F6150
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