Siemens SIPROTEC 7SD80 Manual page 146

Functions
2.11 Automatic Reclosure Function 79 (Optional)
Control of the Internal Automatic Reclosure by an External Protection Device
The internal automatic reclosure function of the device can be controlled by an external protection device. This
is of use, for example, on line ends with redundant protection or additional backup protection when the second
protection is used for the same line end and has to work with the automatic reclosing function integrated in the
7SD80.
The binary inputs and outputs provided for this functionality must be considered in this case. In this context, it
must be decided whether the internal auto reclose function is to be controlled by the starting (pickup) or by the
trip command of the external protection (see also above at „Control Mode of the Automatic Reclosure").
The interaction is controlled via binary outputs and binary inputs:
2889 „79 1.CycZoneRel"
2716 „>79 TRIP 3p"
Figure 2-56 Connection example with external protection device for 3-pole reclosure; AR control mode =
with TRIP
If the internal automatic reclose function is controlled by the pickup, the phase-dedicated pickup signals of the
external protection must be connected if distinction shall be made between different types of fault. The general
trip command then suffices for tripping (no. 2746). Figure 2-57 shows a connection example.
146
Internal automatic reclosure ready for the first reclose cycle, i.e. releases the
element of the external protection decisive for reclosure, the corresponding
output can be used for the second cycle. This output can be omitted if the
external protection does not require an overreaching element (e.g. differen-
tial protection).
Trip signal
SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011