4.7.1.3 Functionality
The distance protection function DSTPDIS provides a full-scheme distance
protection function for distribution networks where three-phase tripping is allowed
for all kinds of faults.
DSTPDIS has five flexible, configurable impedance zones for protection (Z1...Z5).
ZL
Zone Z1
Zone Z5
Zone Z2
Zone Z3
X
R
Zone Z4
Under impedance
start charactristics
Load encroachment
area
Figure 521: Zones of DSTPDIS function (example 1)
ZL
Zone Z1
Zone Z5
Zone Z2
Zone Z3
X
R
Zon Z4
Under impedance
start characteristics
Load encroachment
area
e
Figure 522: Zones of DSTPDIS function (example 2)
The supported zone characteristic shapes are quadrilateral, mho (circular) or bullet
(quadrilateral and mho characteristics combined). Mho can be combined with
directional lines to secure directionality and to enable increased fault resistance
coverage with an offset mho circle.
1MRS759142 F
Protection functions
REX640
Technical Manual
941
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