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GUID-AD789221-4073-4587-8E82-CD9BBD672AE0 V2 EN
Figure 172:
Overadmittance characteristic. Left figure: classical origin-centered
admittance circle. Right figure: admittance circle is set off from the
origin.
Non-directional overconductance characteristic
The non-directional overconductance criterion is enabled with the
Operation mode
setting set to "Go" and
Directional mode
to "Non-directional". The characteristic is
defined with two overconductance boundary lines with the
Conductance forward
and
Conductance reverse
settings. For the sake of application flexibility, the boundary
lines can be tilted by 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.
In case of non-directional conductance criterion, the
Conductance reverse
setting
must be set to a smaller value than
Conductance forward
.
Operation is achieved when the measured admittance moves over either of the
boundary lines.
The non-directional overconductance criterion is applicable in high-
resistance earthed and compensated networks. It must not be applied
in unearthed networks.
Section 4
1MRS758755 A
Protection functions
340
REC615 and RER615
Technical Manual
Summary of Contents for RELION Series
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