Functions
2.2 Protection Data Interfaces and Protection Data Topology
SIPROTEC, 7SD610, Manual
C53000-G1176-C145-6, Release date 02.2011
61
PI1 SYNCMODE = TEL or GPS means that the differential protection will be enabled immediately once the
connection has been re-established (data telegrams are received). The differential protection works with the
value paramterized at address 4506 PROT 1 UNSYM. until the synchronisation has been completed. As soon
as both stations can receive GPS signals and the communication connection has been synchronized via GPS,
the differential protection works with increased sensitivity.
In PI1 SYNCMODE TEL or GPS or TEL and GPS, the transmission time can be measured separately for
transmit and receive direction. If the measured transmission time difference exceeds the value parameterized
at address 4506 PROT 1 UNSYM., the message 3250 „PI 1 PD unsym.“ will be output.
You can determine a limit value PROT1 max ERROR for the permissible rate of faulty protection data telegrams
under address 4513. This parameter can only be set in DIGSI at Display Additional Settings. The preset
value 1 % means that maximum one faulty telegram per 100 telegrams is permissible.
GPS synchronisation (optional)
For the protection data interface, the synchronisation via GPS can be switched ON or OFF at address 4801
GPS-SYNC..
GPS synchronisation means the use of a 1-pulse-per-second signal (1 PPS). This signal is generated by an
external GPS receiver. The 1 PPS signal is connected to port A of the device (see Chapter 3, Table 3-12). The
1 PPS signal has the property that the leading edge presents a maximum deviation of 10 μs (compared
between 2 GPS receivers and under all GPS signal conditions). This feature does not depend on the location.
If the deviation of max. 10 μs is no longer ensured due to bad GPS receiving conditions, the 1 PPS signal must
be switched off by the GPS receiver.
In addition, these GPS receivers can provide further time signals, e.g. DCF77 or IRIG-B. These time signals
can be connected to port A as well. However, they are not suitable for a µs-accurate synchronisation of the
protection data interfaces and, consequently, of the differential protection. The edge accuracy of these time
signals is often insufficient.
At address 4803 TD GPS FAILD you can specify the time after which the indication „GPS loss“ (no. 3247)
is output.
Further parameters concerning GPS synchronization were set for the individual protection data interfaces (see
above).
2.2.3.2 Settings
Addresses which have an appended "A" can only be changed with DIGSI, under Additional Settings.
Addr. Parameter Setting Options Default Setting Comments
4501 STATE PROT I 1 ON
OFF
ON State of protection interface 1
4502 CONNEC. 1 OVER F.optic direct
Com conv 64 kBit/s
Com conv 128 kBit/s
Com conv 512 kBit/s
C37.94 1 slot
C37.94 2 slots
C37.94 4 slots
C37.94 8 slots
F.optic direct Connection 1 over
4505A PROT 1 T-DELAY 0.1 .. 30.0 ms 30.0 ms Prot 1: Maximal permissible delay
time
4506A PROT 1 UNSYM. 0.000 .. 3.000 ms 0.100 ms Prot 1: Diff. in send and receive
time
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