doble F6000 - Appendix D: Global Positioning System; GPS Synchronization for Timing

72A-1589 Rev. C 02/01 D-1
D
DD
D
R
RR
R
A
AA
A
F
FF
F
T
TT
T
2
22
2
/
//
/
2
22
2
1
11
1
/
//
/
0
00
0
1
11
1
Appendix D. Global Positioning System
The receiver and antenna available for the F6150 are useful for
end-to-end testing, where two instruments must be precisely
synchronized in order to simulate a power system fault accurately. Each
F6150 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 F6000
Instruments not connected to the same network be precisely
synchronized. Two F6000 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
on page D-2 gives an overview of all the components required to
conduct an end-to-end test using GPS synchronization.