8
8.3 Timers and Time Delay
106 Digital Fault Recorder, SIMEAS R-PMU, Manual
E50417-H1076-C360-A5, Release 10.2012
8.3 Timers and Time Delay
Timers
As PMU time stamps refer to UTC, a precise GPS radio clock that provides a digital DCF77
output signal must be used.
The GPS satellite radio clock Hopf 6875 with modified SIPROTEC firmware (7XV5664-0AA00))
meets this requirement. This clock obtains the time information via GPS (Global Positioning
System) and has the appropriate accuracy that is required for the Phasor Measurement Unit.
If another timer is to be used, the specifications outlined in chapter 16.1.6, Technical Data must
be observed. Proper functioning of the PMU can only be guaranteed with the Siemens approved
accessories.
Figure 8-1 Example configuration
GPS Clock
(Hopf 6875 )
GPS
Antenna
Lightning
Protection
FG4495 G0
DCF77 OUT
GPS IN
Sync-
Transceiver
BNC
SIMEAS R-PMU
FO (LWL)
BNC
CU
7XV5664-0AA00
7KE6000-8AK/L
7KE6100-0/1x...
Note
Depending on SIMEAS R-PMU firmware version V40.01, the Sync-Box 7KE6000-8HAx recom-
mended for the synchronization of the SIMEAS R V2/V3 (7KE6000-0/1x) can also be used for
the synchronization of the SIMEAS R-PMU. Due to the lower precision, however, this configura-
tion is not recommended. Please note that the PMU data is marked as invalid when using the
Sync-Box.
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