NOTE
The PPS measurement is used to consider the time delay in the send and receive directions. If PPS fails due
to a reception fault or due to a short-term unfavorable satellite position, synchronization via conventional
communication media remains active.
The PPS synchronization parameter offers 3 different setting options:
Parameter Value Description
telegr. and PPS
With this setting, the differential protection is only enabled upon renewed
establishment of the connection, if the communication section is synchron-
ized via PPS or if symmetrical time delays are signaled by an external opera-
tion (binary input).
This results in synchronization with the telegram measurement supported
by the PPS measurement.
telegr. or PPS
In this setting, the differential protection is enabled immediately upon
renewed establishment of connection (data telegrams are received). The
conventional method is used up to synchronization.
This results in synchronization with the telegram measurement supported
by the PPS measurement.
PPS sync. off
This setting means that no synchronization is performed via PPS at the
protection interface. This is typically the case if no time-delay differences
are expected.
The synchronization only takes place with the telegram measurement.
NOTE
The synchronization mode can be set separately for both protection interfaces.
If no further PPS pulse is received within 2.1 s, the time-out supervision responds. If no new 2nd pulse occurs
after the expiry of the supervision time, the indication PPS pulse loss is issued.
[loppssyn-100113-01.tif, 1, en_US]
Figure 3-54 Setting the PPS Synchronization
The binary input >PPS pulse loss can be used to signal an externally detected failure in the PPS signal (for
example, error message from the receiver). Setting this binary input also leads to the indication PPS pulse
loss.
If you are using a second pulse from a GPS receiver, you must ensure that a loss of reception or reception
disturbances do not generate a second pulse. The GPS receivers recommended by Siemens are set by default
System Functions
3.5 Protection Communication
SIPROTEC 5, Overcurrent Protection, Manual 127
C53000-G5040-C017-8, Edition 07.2017
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