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2 Functions
2.2
Protection Data Interfaces and Protection Data Topology
As described in the explanation of the function principle of differential protection (Sec-
tion 2.3), the devices which belong to the protected object limited by the current trans-
former sets have to exchange the data of the ends of the protected object. This applies
not only for the measured quantities relevant for the differential protection itself, but
also for all data which are to be available at the ends. This includes the synchroniza-
tion and topological data as well as the intertripping, transfer trip, remote annunciation
signals and measured values. The topology of the protected object, the allocation of
the devices to the ends of the protected object and the allocation of the ways of com-
munication to the devices protection data interfaces form the topology of the protection
system and its communication.
2.2.1
Functional Description
2.2.1.1
Protection Data Topology / Protection Data Communication
Protection Data
For a standard layout of lines with two ends, you require one protection data interface
Topology
for each device. The protection data interface is named PI1 (see also Figure 2-7). The
corresponding protection data interface must be configured as Enabled during con-
figuration of the functional scope (see Section 2.1.1).
With 7SD5 it is also possible to connect both protection data interfaces with each other
provided the two devices have two protection data interfaces each and the relevant
means for transmission are available. This provides for 100 % redundancy as far as
the transmission is concerned (Figure 2-8). The devices autonomously search for the
fastest communication 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 2-7
Figure 2-8
74
Differential protection for two ends with two 7SD5 devices, each of them having
one protection data interface (transmitter/receiver)
Differential protection for two ends with two 7SD5 each of them having two pro-
tection data interfaces (transmitter/receiver)
7SD5 Manual
C53000-G1176-C169-1
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