Siemens siprotec 7SD5 User Manual page 296

2 Functions
Binary inputs:
383„>Enable ARzones"
382„>Only 1ph AR"
381 „>1p Trip Perm"
Binary outputs:
501 „Relay PICKUP"
512 „Relay TRIP 1pL1"
513 „Relay TRIP 1pL2"
514 „Relay TRIP 1pL3"
515 „Relay TRIP 3ph."
In order to obtain a phase-segregated trip indication, the respective single-pole trip
commands must be combined with the three-pole trip command on one output.
Figure, 2-124 for example, shows the interconnection between a 7SD5 and an exter-
nal reclosure device with a mode selector switch.
Depending on what the external recloser device requires, the three single-pole outputs
(No. 512, 513, 514) may also be combined to one „single-pole tripping" output; the No.
515 provides the „three-pole tripping" signal to the external device.
For exclusively three-pole auto-reclosure cycles, the general pickup (No. 501, if re-
quired by the external reclosure device) and general trip signal (No. 511) from 7SD5
(see Figure 2-125) usually suffice.
296
With this binary input, the external reclosure device
controls stages of the individual short-circuit protection
functions which are active before reclosure (e.g. over-
reaching zone in the distance protection). This input is
not required if no overreaching stage is used (e.g. dif-
ferential protection or comparison mode with distance
protection, see also above margin heading „Selectivity
before Reclosure").
The external reclosure device is only programmed for
one pole; the stages of the individual protection func-
tions that are activated before reclosure via No. 383
only do so in the case of single-phase faults; in the
event of multiple-phase faults these stages of the indi-
vidual short-circuit functions do not operate. This input
is not required if no overreaching stage is used (e.g.
differential protection or comparison mode with dis-
tance protection, see also above margin heading „Se-
lectivity before Reclosure").
The external reclosure device allows one-pole tripping
(logic inversion or three-pole coupling). If this input is
not assigned or not routed (matrix), the protection
functions trip three-pole for all faults. If the external re-
closure device cannot supply this signal but supplies a
„three-pole coupling" signal instead, this must be taken
into account in the allocation of the binary inputs: the
signal must be inverted in this case (L-active = active
without voltage).
Start of protection device, general (if required by exter-
nal recloser device).
Trip of the device 1-pole L1.
Trip of the device 1-pole L2.
Trip of the device 1-pole L3.
Trip protective device 3-pole.
7SD5 Manual
C53000-G1176-C169-1