2 Functions
202
7SD5 Manual
C53000-G1176-C169-1
In the case of the blocking scheme and the underreach transfer trip scheme, the echo
function is not required and therefore ineffective.
Figure 2-86 Logic diagram of the echo function for distance protection with teleprotection
2.7.14 Setting Notes
General The teleprotection supplement of distance protection is only in service if it is set during
the configuration to one of the possible modes of operation in address 121. Depend-
ing on this configuration, only those parameters which are applicable to the selected
mode appear here. If the teleprotection supplement is not required the address 121 is
set to Teleprot. Dist. = Disabled.
The following modes are possible with conventional transmission links (as described
in Section 2.7):
Direct Underreach Transfer Trip Remote trip without any pickup,
PUTT (Pickup) PUTT (Pickup)
PUTT (Z1B) Permissive Underreach Transfer Trip with Zone Accel-
eration Z1B (PUTT)
POTT Permissive Overreach Transfer Trip (POTT),
Dir.Comp.Pickup Directional comparison pickup,
UNBLOCKING Directional unblocking scheme,
BLOCKING Directional blocking scheme,
Pilot wire comp Pilot wire comparison,
Rev. Interlock Reverse interlock
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