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Re(Yo)
Re(Yo)
Re(Yo)
Im(Yo)
Susceptance
forward
Re(Yo)
Im(Yo)
Re(Yo)
Im(Yo)
TRIP
TRIP
TRIP
TRIP
TRIP
TRIP
Susceptance
forward
Susceptance
forward
Susceptance
tilt
Ang
>0
Susceptance
tilt
Ang
<0
GUID-3E09080E-9063-4D3B-A29E-3AA34EB03812 V1 EN
Figure 184:
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
.
Operation is achieved when the measured admittance moves outside the characteristic.
The combined overadmittance and overconductance criterion is applicable in
ungrounded, high-resistance grounded and compensated networks or in systems where
the system grounding may temporarily change during normal operation from
compensated network to ungrounded system.
Compared to the overadmittance criterion, the combined characteristic improves
sensitivity in high-resistance grounded and compensated networks. Compared to the non-
directional overconductance criterion, the combined characteristic enables the protection
to be applied also in ungrounded systems.
Section 4
1MAC059074-MB A
Protection functions
390
615 series ANSI
Technical Manual
Содержание Relion 615 series
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