2.13 Automatic reclosure function (optional)
241
7SA522 Manual
C53000-G1176-C155-3
Controlling the In-
ternal Automatic
Reclosure by an
External Protection
Device
If the 7SA522 is equipped with the internal automatic reclosure function, it may also
be controlled by an external protection device. This is of use for example on line ends
with redundant protection or additional back-up protection when the second protection
is used for the same line end and has to work with the automatic reclosure function
integrated in the 7SA522.
The binary inputs and outputs provided for this functionality must be considered in this
case. It must be decided whether the internal auto-reclosure is to be controlled by the
starting (pickup) or by the trip command of the external protection (see also above
under “Control Mode of the Automatic Reclosure”).
If the auto-reclosure is controlled by the trip command, the following inputs and
outputs are recommended to be used:
The automatic reclosure function is started via the Binary inputs
:
2711 ´!$56WDUWµ General fault detection for the automatic reclosure
circuit (only required for action time),
2712 ´!7ULS/$5µ Trip command L1 for the automatic reclosure circuit,
2713 ´!7ULS/$5µ Trip command L2 for the automatic reclosure circuit,
2714 ´!7ULS/$5µ 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 2-105 shows the interconnection between the internal automatic reclosure of
7SA522 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 ´$5S7ULS3HUPµ Internal automatic reclosure function ready for 1-pole
reclose cycle, i.e. allows 1-pole tripping (logic inversion
of the 3-pole coupling).
2889 ´$5&\F=RQH5HOµ 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 ´$53URJUDPSROHµ 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).
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