Figure 224: Combined forward directional overconductance and forward directional
oversusceptance characteristic. Left figure: the Conductance tilt Ang and
Susceptance tilt Ang settings equal zero degrees. Right figure: the setting
Conductance tilt Ang > 0 degrees and the setting Susceptance tilt Ang < 0 degrees.
Figure 225: Combined non-directional overconductance and non-directional
oversusceptance characteristic
The non-directional overconductance and non-directional
oversusceptance characteristic provides a good sensitivity and
selectivity when the characteristic is set to cover the total admittance
of the protected feeder with a proper margin.
The sign of the admittance characteristic settings should be considered
based on the location of characteristic boundary in the admittance
plane. All forward-settings are given with positive sign and reverse-
settings with negative sign.
1MRS757644 H Protection functions
620 series
Technical Manual
447
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