Re(Yo)
Im(Yo)
Im(Yo)
TRIP
TRIP
Re(Yo)
Circle
radius
Circle
radius
Circle
conductance
Circle
susceptance
Conductance
forward
Conductance
reverse
TRIP
TRIP
Conductance
forward
Conductance
reverse
TRIP
TRIP
TRIP
TRIP
Conductance
tilt
Ang
GUID-1CA6B05B-D011-47E0-B251-7F5F6C18C81F V1 EN
Figure 185:
Combined overadmittance and overconductance characteristic. Left
figure: classical origin-centered admittance circle combined with two
overconductance boundary lines. Right figure: admittance circle is set off
from the origin.
Combined overconductance and oversusceptance characteristic
The combined overconductance and oversusceptance criterion is enabled with the
Operation mode
setting set to "Go, Bo".
By setting
Directional mode
to "Forward", the characteristic is a combination of two
boundary lines with the settings
Conductance forward
and
Susceptance forward
. See
.
By setting
Directional mode
to "Non-directional", the characteristic is a combination of
four boundary lines with the settings
Conductance forward
,
Conductance reverse
,
Susceptance forward
and
Susceptance reverse
. See
For the sake of application flexibility, the boundary lines can be tilted by the angle defined
with the
Conductance tilt Ang
and
Susceptance tilt Ang
settings. By default, the tilt angles
are zero degrees, that is, the boundary lines are straight lines in the admittance plane. A
positive
Conductance tilt Ang
value rotates the overconductance boundary line
counterclockwise from the vertical axis. A positive
Susceptance tilt Ang
value rotates the
oversusceptance boundary line counterclockwise from the horizontal axis.
In case of the non-directional conductance and susceptance criteria, the
Conductance
reverse
setting must be set to a smaller value than
Conductance forward
and the
Susceptance reverse
setting must be set to a smaller value than
Susceptance forward
.
Operation is achieved when the measured admittance moves outside the characteristic.
1MAC059074-MB A
Section 4
Protection functions
615 series ANSI
391
Technical Manual
Summary of Contents for Relion 615 series
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