Functions
2.7 Teleprotection for Distance Protection (optional)
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
212
To prevent that an echo is created after switching off the line and dropout of the pickup, an echo can no longer
be created if a pickup has already been present (RS flip-flop in Figure 2-102). Furthermore, the echo can be
blocked at anytime via the binary input „>Dis.T.BlkEcho“.
Figure 2-102 shows the generation of the echo release signal. Since this function is also associated with the
weak infeed tripping, it is described separately (see Section 2.11.1).
Figure 2-102 Generation of the echo release signal
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. Depending 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) Permissive Underreach Transfer Trip with pickup PUTT
PUTT (Z1B) Permissive Underreach Transfer Trip with Zone Acceleration 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
At address 2101 FCT Telep. Dis. the use of a teleprotection scheme can be turned ON or OFF.
If the teleprotection has to be applied to a three terminal line the setting in address 2102 must be Type of
Line = Three terminals, if not, the setting remains Two Terminals.
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