2.4 Distance protection Z<
2 Protection functions
Technical description
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VM259.EN007
2.4.4.
Distance protection applications
The behavior of distance zones
Characteristic type 1.
In the characteristic type 1 the line angle is set to 90 degrees.
The resistive setting R is set above the reactive setting X.
Therefore the resistive reach does not reach as far on the
second quadrant as on the first quadrant. The load setting R
and the angle setting of load block can be found from ―distance
common settings‖ menu. These values are being used only if
the ―Load block in use‖ is selected as ―Yes‖. The tolerance of
inaccuracy is now taken from the R setting. This is because the
R value is greater than the X value. If the allowed inaccuracy is
for example 5 % and R setting is 10 Ω the allowed tolerance
would be 0.5 Ω.