Siemens siprotec 7SA6 User Manual page 362

Functions
6-180
The binary inputs and outputs provided for this functionality must be considered in this
case. It must be decided whether the internal automatic reclosure function is to be
controlled by the fault detection (pickup) or by the trip command of the external
protection (see also above under "Operating Modes of the Automatic Reclosure
Function", page 6-170).
If the automatic reclosure is controlled by the trip command, the following inputs and
outputs are recommended:
The automatic reclosure function is started via the binary inputs:
 !$5 6WDUW
 !7ULS / $5
 !7ULS / $5
 !7ULS / $5
The general fault detection determines the starting of the action times. It is also
necessary if the automatic reclosure is to detect evolving 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 6-99 for example shows the interconnection between the internal automatic
reclosure function in the 7SA6 and an external protection device.
To achieve three-pole coupling of the external protection and to release, if necessary,
its accelerated stages before reclosure the following output signals are suitable:
 $5 S 7ULS 3HUP internal automatic reclosure function ready for 1-pole
 $5 &\F=RQH5HO internal automatic reclosure function ready for the first
 $5 3URJUDPSROH internal automatic reclosure function is programmed for
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 —, i.e. assign the following binary
inputs of the 7SA6:
 !$5 6WDUW
 !7ULS SROH $5 trip command 1-pole for the internal automatic reclosure
general fault detection signal for automatic reclosure
(only required for action time),
trip command L1 for automatic reclosure,
trip command L2 for automatic reclosure,
trip command L3 for automatic reclosure,
reclose cycle, i.e. allows 1-pole tripping (logic inversion of
the 3-pole coupling).
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).
one pole, i.e. only recloses after single-pole tripping.
This output can be omitted if no overreaching stage is
required (e.g. differential protection or comparison mode
with distance protection).
general fault detection for the internal automatic
reclosure function (only required for action time),
function,
7SA6 Manual
C53000-G1176-C133-1