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Forward directional oversusceptance characteristic
The forward directional oversusceptance criterion is enabled with the
Operation mode
setting set to "Bo" and
Directional mode
to "Forward". The characteristic is defined
by one oversusceptance boundary line with the
Susceptance forward
setting. For the
sake of application flexibility, the boundary line can be tilted by the angle defined with
the
Susceptance tilt Ang
setting. By default, the tilt angle is zero degrees, that is, the
boundary line is a horizontal line in the admittance plane. A positive tilt value rotates
the boundary line counterclockwise from the horizontal axis.
Operation is achieved when the measured admittance moves over the boundary line.
The forward directional oversusceptance criterion is applicable in
unearthed networks. It must not be applied to compensated networks.
GUID-43B0F2F9-38CE-4F94-8381-0F20A0668AB1 V2 EN
Figure 175:
Forward directional oversusceptance characteristic. Left figure:
classical forward directional oversusceptance criterion. Middle
figure: characteristic is tilted with negative tilt angle. Right figure:
characteristic is tilted with positive tilt angle.
Combined overadmittance and overconductance characteristic
The combined overadmittance and overconductance criterion is enabled with the
Operation mode
setting set to "Yo, Go" and
Directional mode
to "Non-directional".
The characteristic is a combination of a circle with the radius defined with the
Circle
radius
setting and two overconductance boundary lines with the settings
Conductance
forward
and
Conductance reverse
. For the sake of application flexibility, the midpoint
of the circle can be moved from the origin with the
Circle conductance
and
Circle
susceptance
settings. Also the boundary lines can be tilted by the angle defined with
the
Conductance tilt Ang
setting. By default, the
Circle conductance
and
Circle
susceptance
are 0.0 mS and
Conductance tilt Ang
equals zero degrees, that is, the
characteristic is a combination of an origin-centered circle with two vertical
overconductance boundary lines. A positive tilt value for the
Conductance tilt Ang
setting rotates boundary lines counterclockwise from the vertical axis.
In case of the non-directional conductance criterion, the
Conductance reverse
setting
must be set to a smaller value than
Conductance forward
.
Section 4
1MRS758755 A
Protection functions
342
REC615 and RER615
Technical Manual
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