320°
200°
80°
AG sector
CG sector
BG sector
V2A
(Ref)
en06000384_ansi.vsd
ANSI06000384 V1 EN
Figure 150: Condition 1: Definition of faulty phase sector as angle between V
2
and
I
0
The angle is calculated in a directional function block and gives the angle in radians as
input to the V
2
and I
0
function block. The input angle is released only if the fault is in
forward direction. This is done by the directional element. The fault is classified as
forward direction if the angle between V
0
and I
0
lies between 20 to 200 degrees, see
figure
151.
200°
Reverse
Forward
20°
en06000385.vsd
IEC06000385 V1 EN
Figure 151: Directional element used to release the measured angle between V
o
and I
0
The input radians are summarized with an offset angle and the result evaluated. If the
angle is within the boundaries for a specific sector, the phase indication for that sector
1MRK505222-UUS C Section 6
Impedance protection
295
Technical reference manual
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