Functions
6-162 7SA522 Manual
C53000-G1176-C119-2
these stages do not operate. This input is not required if no
overreaching stage is used (e.g. ddifferential protection or
comparison mode with distance protection, see also above
under subtitle "Selectivity before reclosure").
!S7ULS3HUPThe external reclosure device allows 1-pole tripping (logic
inversion of 3-pole coupling). If this input is not assigned or
not routed (matrix), the protection functions trip 3-pole for all
faults. If the external reclosure device cannot supply this
signal but supplies a "3-pole coupling" signal instead, this
must be taken into account in the routing of the binary inputs
(see section 5.2): The signal must be inverted in this case
(L–active = active without voltage).
Binary outputs:
5HOD\3,&.83 Start of protection device, general (if required by external
recloser device).
5HOD\75,3SKtrip protective device 3-pole,
5HOD\75,3S/trip protective device 1-pole phase L1.
5HOD\75,3SKtrip protective device 3-pole,
5HOD\75,3S/trip protective device 1-pole phase L2.
5HOD\75,3SKtrip protective device 3-pole,
5HOD\75,3S/trip protective device 1-pole phase L3.
In order to obtain a phase-segragated trip indication, the respective single-pole trip
commands must be combined with the three-pole trip command on one output.
Figure 6-86 for example shows the interconnection between a 7SA522 and an exter-
nal reclosure device with a mode selector switch.
Depending on what the external recloser device requires, the three single-pole outputs
(F.No , , ) may also be combined to one "single-pole tripping" output; the
F.No provides the "three-pole tripping" signal to the external device.
If only three-pole reclosure takes place, general starting (F.No , if required by the
external reclosure device) and the trip signals (F.No) from 7SA522 (see figure 6-
87) usually suffice.
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