2 Functions
50
7SD610 Manual
C53000-G1176-C145-4
Table 2-2 Communication via Direct Connection
Figure 2-5 Examples for communication connections
Establishing the
protection data
communication
When the devices of a differential protection system are linked to each other and
switched on, they communicate by themselves. The successful connection is indicat-
ed by an indication, e.g. with „Rel2 Login“, when device 1 has detected device 2.
Each device of a differential protection system informs the other device of the success-
ful protection data communication.
These are helpful features during commissioning and are described, together with
further commissioning tools, in the Section „Mounting and Commissioning“. But even
during operation, the proper communication of the devices can be checked.
Monitoring the
communication
The communication is permanently monitored by the devices.
Single faulty data telegrams are not a direct risk if they occur only occasionally. They
are recognized and counted in the device which detects the disturbance and can be
read out per unit of time as statistical information (Annunciation → Statistic).
Module in
the Device
Connector
Type
Fibre Type Optical
Wavelength
Perm. Path At-
tenuation
Distance,
Typical
FO5 ST Multimode
62.5/125 µm
820 nm 8 dB 1.5 km (0.94
miles)
FO6 ST Multimode
62.5/125 µm
820 nm 16 dB 3.5 km (2.18
miles)
FO17 LC Monomode
9/125 µm
1300 nm 13 dB 24 km (14.9
miles)
FO18 LC Monomode
9/125 µm
1300 nm 29 dB 60 km (37.3
miles)
FO19 LC Monomode
9/125 µm
1550 nm 29 dB 100 km (62
miles)
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