2 Functions
298
7SD5 Manual
C53000-G1176-C169-1
The automatic reclosure function is started via the Binary inputs:
2711 „>AR Start“ General fault detection for the automatic reclosure
circuit (only required for action time),
2712 „>Trip L1 AR“ Trip command L1 for the automatic reclosure circuit,
2713 „>Trip L2 AR“ Trip command L2 for the automatic reclosure circuit,
2714 „>Trip L3 AR“ Trip command L3 for the automatic reclosure circuit.
The general fault detection determines the starting of the action times. It is also nec-
essary if the automatic reclosure circuit is to detect sequential faults by fault detection.
In other cases this input information is superfluous.
The trip commands decide whether the dead time for single-pole or three-pole reclose
cycles is activated or whether the reclosure is blocked in the event of a three-pole trip
(depending on the set dead times).
Figure 2-126 shows the interconnection between the internal automatic reclosure of
7SD5 and an external protection device, as a connection example for single-pole
cylces.
To achieve three-pole coupling of the external protection and to release, if necessary,
its accelerated stages before reclosure the following output
functions are suitable:
2864 „AR 1p Trip Perm“ Internal automatic reclosure function ready for single-
pole reclose cycle, i.e. allows single-pole tripping (logic
inversion of the three-pole coupling).
2889 „AR 1.CycZoneRel“ Internal automatic reclosure function ready for the first
reclose cycle, i.e. releases the stage of the external
protection device for reclosure, the corresponding
outputs can be used for other cycles. This output can
be omitted if the external protection does not require
an overreaching stage (e.g. differential protection or
comparison mode with distance protection).
2820 „AR Program1pole“ Internal automatic reclosure function is programmed
for one pole, i.e. only recloses after single-pole trip-
ping. This output can be omitted if no overreaching
stage is required (e.g. differential protection or compar-
ison mode with distance protection).
Instead of the three-phase-segregated trip commands, the single-pole and three-pole
tripping may also be signalled to the internal automatic reclosure function — provided
that the external protection device is capable of this. In that case, the following binary
inputs of the 7SD5 are assigned:
2711 „>AR Start“ General fault detection for the internal automatic reclo-
sure function (only required for action time),
2715 „>Trip 1pole AR“ Trip command single-pole for the internal automatic re-
closure,
2716 „>Trip 3pole AR“ Trip command three-pole for the internal automatic re-
closure function,
If only three-pole reclosure cycles are to be executed, it is sufficient to assign the
binary input „>Trip 3pole AR“ (No. 2716) for the trip signal. Figure 2-127 shows
an example. Any overreaching stages of the external protection are enabled again by
„AR 1.CycZoneRel“ (No. 2889) and of further cycles, if applicable.
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