Functions
6-78
7SA522 Manual
C53000-G1176-C119-2
6.4.1
Method of Operation
Switching
On and Off
The teleprotection function can be switched on and off by means of the parameter
, or via the system interface (if available) and via binary input
(if this is allocated). The switched state is saved internally (refer to Figure 6-43) and
secured against loss of auxiliary supply. It is only possible to switch on from the source
where previously it had been switched off from. To be active, it is necessary that the
function is switched on from all three switching sources.
Figure 6-43 Switching on and off of the teleprotection
6.4.1.1
Permissive Underreach Transfer Trip with Zone Acceleration Z1B (PUTT)
Principle
Figure 6-44 shows the operation scheme for this permissive underreach transfer trip
scheme. In the case of a fault inside zone Z1, the transfer trip signal is sent to the op-
posite line end. The signal received there causes tripping if the fault is detected inside
the zone Z1B in the set direction. The transmitted signal may be prolonged by T
S
(set-
table in address
), to compensate for possible differences in
the pick-up times at the two line ends. The distance protection is set such that the first
zone reaches up to approximately 80 % of the line length, the overreaching zone how-
ever is set to reach beyond the opposite substation (approximately 120 % of the line
length). In the case of three terminal lines, Z1 is also set to approximately 80 % of the
shortest line section but at least beyond the tee off point. Z1B must securely reach be-
yond the longer line section, even when additional infeed is possible via the tee point.
≥
1
>Dis.Telep.OFF
Dis Telep. off
ON
OFF
)&77HOHS'LV
>Dis.Telep. ON
S
R
System port: Dis.Telep.OFF
S
R
„1“
System port: Dis.Telep.ON
Summary of Contents for siprotec 7SA522
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