2.4 Protection data interfaces and communication topology (optional)
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7SA522 Manual
C53000-G1176-C155-3
2.4 Protection data interfaces and communication topology (optional)
Where a teleprotection scheme is to be used to achieve 100 % instantaneous protec-
tion (Section 2.6), digital communication channels can be used for data transmission
between the devices. In addition to the protection data, other data can be transmitted
and thus be made available at the line ends. This data includes synchronization and
topology data, as well as remote trip signals, remote annunciation signals and mea-
sured values. The topology of the protection data communication system is constitut-
ed by the allocation of devices to the ends of the protected object and by the allocation
of communication paths to the protection data interfaces of the devices.
2.4.1 Function Description
Communication
Topology
For a standard layout of lines with two ends, you require one protection data interface
for each device. The protection data interface is named PI (see also Figure2-41). The
corresponding protection data interface must have been set to (QDEOHG during con-
figuration of the scope of functions (refer to Subsection 2.1.1). In addition, indices
must be assigned to the devices (refer to Sub-Section 2.4.2 under margin heading
“Communication Topology”).
Using two 7SA522 relays you can connect both protection data interfaces with each
other provided the two devices are equipped with two protection data interfaces each
the necessary means for transmission available. This yields 100% redundancy as of
the transmission (Figure 2-42). The devices autonomously search for the fastest com-
munication link. If this link is faulty, the devices automatically switch over to the other
link which is then used until the faster one is healthy again.
Figure 2-41 Distance protection for two ends with two 7SA522 devices with one protection
data interface each (transmitter/ receiver)
Figure 2-42 Distance protection for two ends with two 7SA522 devices with two protection
data interface each (transmitter/ receiver)
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