Forward directional overconductance characteristic
The forward directional overconductance criterion is enabled with the
Operation
mode
setting set to "Go" and
Directional mode
set to "Forward". The characteristic
is defined by one overconductance boundary line with the
Conductance forward
setting. For the sake of application flexibility, the boundary line can be tilted with
the angle defined with the
Conductance tilt Ang
setting. By default, the tilt angle is
zero degrees, that is, the boundary line is a vertical line in the admittance plane. A
positive tilt value rotates the boundary line counterclockwise from the vertical axis.
Operation is achieved when the measured admittance moves over the boundary
line.
The forward directional overconductance criterion is applicable in high-
resistance earthed and compensated networks. It must not be applied in
unearthed networks.
Figure 173: Forward directional overconductance characteristic. Left figure: classical
forward directional overconductance criterion. Middle figure: characteristic is tilted
with negative tilt angle. Right figure: characteristic is tilted with positive tilt angle.
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.
1MRS758755 C Protection functions
REC615 & RER615
Technical Manual
357
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