ABB RELION REX640 Technical Manual page 508

Protection and control

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Protection functions

Figure 290: 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 291: 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.

1MRS759142 F

Technical Manual