Functions
6-164 7SA522 Manual
C53000-G1176-C119-2
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 con-
trolled by the starting or by the trip command of the external protection (see also above
under "Operating modes of the automatic reclosure function“ (Page 6)).
If the automatic reclosure circuit is controlled by the trip command
, the following inputs
and outputs are recommended:
The automatic reclosure function is started via the binary inputs:
!$56WDUW general fault detection for the automatic reclosure circuit
(only required for action time),
!7ULS/$5 trip command L1 for the automatic reclosure circuit,
!7ULS/$5 trip command L2 for the automatic reclosure circuit,
!7ULS/$5 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 6-88 for example shows the interconnection between the internal automatic re-
closure function in the 7SA522 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:
$5S7ULS3HUP internal automatic reclosure function ready for 1-pole
reclose cycle, i.e. allows 1-pole tripping (logic inversion of
the 3-pole coupling).
$5&\F=RQH5HO internal automatic reclosure function ready for the first
reclose cycle, i.e. releases the stage of the external
protection device for reclosure, the corresponding out-
puts 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 com-
parison mode with distance protection).
$53URJUDPSROH internal automatic reclosure function is programmed for
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).
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 7SA522:
!$56WDUW general fault detection for the internal automatic
reclosure function (only required for action time),
!7ULSSROH$5trip command 1-pole for the internal automatic reclosure
function,
!7ULSSROH$5 trip command 3-pole for the internal automatic reclosure
function,
To Next Page
Loading...
Need help?
General
