Functions
2.7 Teleprotection for Distance Protection (optional)
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
204
Sequence
Figure 2-96 shows the logic diagram of the blocking scheme for one line end.
The overreach zone Z1B is blocked which is why it must be set to Forward (address 1651 Op. mode Z1B,
see also Section 2.5.1 at margin heading „Controlled Zone Z1B“).
On two terminal lines, the signal transmission may be phase segregated. In this case, send and receive circuits
operate separately for each phase. On three terminal lines, the transmit signals are sent to both opposite line
ends. The receive signals are then combined with a logical OR gate as no blocking signal must be received
from any line end during an internal fault. With the parameter Type of Line (address 2102) the device is
informed as to whether it has one or two opposite line ends.
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