Distance Protection With Polygonal Tripping Characteristic (Optional); Method Of Operation - Siemens SIPROTEC 7SA6 Manual

F.No. Alarm
3813 Dis.TripZ1B1p
3825 DisTRIP3p.Z1Bsf
3826 DisTRIP3p Z1Bmf
3816 Dis.TripZ2/1p
3817 Dis.TripZ2/3p
3818 Dis.TripZ3/T3
3821 Dis.TRIP 3p. Z4
3822 Dis.TRIP 3p. Z5
3850 DisTRIP Z1B Tel
3819 Dis.Trip FD->
3820 Dis.Trip <->
6.2.4

Distance Protection with Polygonal Tripping Characteristic (optional)

6.2.4.1

Method of Operation

Operating
Polygons
7SA6 Manual
C53000-G1176-C156-2
Distance TRIP single-phase Z1B
DisTRIP 3phase in Z1B with single-ph Flt
DisTRIP 3phase in Z1B with multi-ph Flt.
Distance TRIP single-phase Z2
Distance TRIP 3phase in Z2
Distance TRIP 3phase in Z3
Distance TRIP 3phase in Z4
Distance TRIP 3phase in Z5
DisTRIP Z1B with Teleprotection scheme
Dist.: Trip by fault detection, forward
Dist.: Trip by fault detec, rev/non-dir.
A tripping characteristic in the shape of a polygon is defined for each of the distance
zones. In total, there are five independent zones and one additional controlled zone
for each fault impedance loop. In Figure 6-29 the shape of a polygon is illustrated. The
first zone is shaded and forward directional, the third zone is reverse directional.
In general, the polygon is defined by means of a parallelogram which intersects the
axes with the values R and X as well as the tilt ϕ
und ϕ
R may be used to cut the area of the load impedance out of the polygon.
Load Load
The axial coordinates can be set individually for each zone; ϕ
common for all zones. The parallelogram is symmetrical with respect to the origin of
the R–X–coordinate system; the directional characteristic however limits the tripping
range to the desired quadrants (refer to "Direction Determination" below).
The R-reach may be set separately for the phase–phase faults and the phase–earth
faults to achieve a larger fault resistance coverage for earth faults if this is desired.
For the first zone an additional tilt α exists, which may be used to prevent overreach
resulting from angle variance and/or two ended infeed to short-circuits with fault resist-
ance. For Z1B and the higher zones this tilt does not exist.
Comments
. A load trapezoid with the setting
Line
, R
Line Load
Functions
und ϕ
are
Load
6-55