ABB RELION REX640 Technical Manual page 478

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Protection functions

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.

The combined overconductance and oversusceptance criterion is applicable in high-

resistance earthed, unearthed and compensated networks or in the systems where the

system earthing may temporarily change during normal operation from compensated

to unearthed system.

GUID-80C5322D-13A3-43B6-8C75-BE530111EE3B V1 EN

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.

1MRS759142 C

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