Functions
6-1077SA6 Manual
C53000-G1176-C156-2
Sequence Figure 6-63 shows the logic diagram of the blocking scheme for one line end.
The relevant distance zone for this scheme is the overreach zone Z1B. Its reach di-
rection must therefore be set to
Forward:address1351 Op. mode Z1B,referalso
to Sub-section 6.2.4.2 under margin heading “Controlled Zone Z1B”.
On lines with two ends, the signal transmission may be phase segregated. Send and
receive circuits in this case are built up for each phase. On three terminal lines the
send signal is transmitted to both opposite ends. The receive signal are then com-
binedwiththelogical
OR function, as in the case of an internal fault, no blocking signal
must be received from any line end. Via the setting
Line Config. (address 2102)
the device is informed as to whether it has one or two opposite line ends.
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