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The overadmittance criterion is typically applied in ungrounded networks, but it can also
be used in compensated networks, especially if the circle is set off from the origin.
Im(Yo)
Re(Yo)
Circle
radius
TRIP
TRIP
TRIP
TRIP
Im(Yo)
Re(Yo)
Circle
radius
TRIP
TRIP
TRIP
TRIP
Circle
conductance
Circle
susceptance
GUID-202AAFD7-C61F-4169-881E-25757CECE368 V1 EN
Figure 181:
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 grounded and compensated networks. It must not be applied in
ungrounded networks.
1MAC059074-MB A
Section 4
Protection functions
615 series ANSI
387
Technical Manual
Содержание Relion 615 series
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