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7SA6 Manual
C53000-G1176-C156-2
Figure 6-48
Distance Protection topology for 3 ends with 3 devices - example
In address 4710 LOCAL RELAY you finally indicate the actual local device. Enter the
index for each device (according to the consecutive numbering used). Each index
from 1 to the entire number of devices must be used once, but may not be used twice.
Make sure that the parameters of the Distance Protection topology for the Distance
Protection system are conclusive:
• Each device index can only be used once;
• Each device index must be allocated unambiguously to a device ID;
• Each device-index must be the index of a local device once.
• The device with index 1 is the source for the absolute time management (absolute
time master).
During startup of the protection system, the above listed conditions are checked. If one
out of these conditions is not fulfilled, none of the protection data communication
functions will be available. However, the other functions of the 7SA6, especially the
Distance Protection function, continue being enabled. The device signals " DT
inconsistent " ("Device table inconsistent").
Functions
6-83
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