2 Functions
116
7SA522 Manual
C53000-G1176-C155-3
Using three ends, at least one 7SA522 device with two protection data interfaces is
required. Thus a communication chain can be formed. The number of devices (ad-
dress 180%(52)5(/$<) must correspond to the number of ends of the pro-
tected object. Please observe that only current transformer sets that limit the protected
object are counted. The line in Figure 2-43, for instance, has three ends and three
devices. It is limited by three current transformer sets.
The communication chain begins at the device with index 1 at its protection data inter-
face 3,17(5)$&(, continues in the device with index 3 at PI2, runs from device
with index 3 from 3,17(5)$&( to the device with index 2 at 3,17(5)$&(.
The example shows that the indexing of the devices must not necessarily have to cor-
respond to the arrangement of the communication chain. Which protection data inter-
face is connected to which protection data interface does not play a role.
Figure 2-43 Distance protection for three ends with three 7SA522, chain topology
Communication
Media
The communication is enabled via direct optical fibre connections or communication
networks. Which kind of media is used, depends on the distance and on the commu-
nication media available. For shorter distances a direct connection via optical fibres
having a transmission rate of 512kBit/s is possible. Otherwise we recommend com-
munication converters. A transmission via modem and communication networks can
also be realized. Please take into consideration that the responding times of the pro-
tection data communication depend on the quality of transmission and that they are
prolonged in case of a reduced transmission quality and /or an increased transmission
time.
Figure 2-44 shows some examples for communication connections. In case of a direct
connection the distance depends on the type of the optical fibre. Table 2-5 lists the
options available. Different types of modules can be installed in the device. For order-
ing information see Appendix, Subsection Accessories.
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