CHAPTER 7: PROTECTION GROUPED PROTECTION ELEMENTS
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL 205
Z0/Z1 Magnitude
Range: 0.00 to 10.00 in steps of 0.01
Default: 2.70
This setting specifies the ratio between the zero-sequence and positive-sequence
impedance required for zero-sequence compensation of the ground distance elements.
This setting is available on a per-zone basis, enabling precise settings for tapped, non-
homogeneous, and series compensated lines.
Z0/Z1 Angle
Range: –90 to 90° in steps of 1
Default: 0°
This setting specifies the angle difference between the zero-sequence and positive-
sequence impedance required for zero-sequence compensation of the ground distance
elements. The entered value is the zero-sequence impedance angle minus the positive-
sequence impedance angle. This setting is available on a per-zone basis, enabling
precise values for tapped, non-homologous, and series-compensated lines.
Z0M/Z1 Magnitude
Range: 0.00 to 7.00 in steps of 0.01
Default: 0.00
The ground distance elements can be programmed to apply compensation for the zero-
sequence mutual coupling between parallel lines. If this compensation is required, the
ground current from the parallel line (3I_0) measured in the direction of the zone being
compensated must be connected to the ground input CT of the CT bank configured in
the Distance > Common > Source setting. This setting specifies the ratio between the
magnitudes of the mutual zero-sequence impedance between the lines and the
positive-sequence impedance of the protected line. Set this setting to zero if the
compensation is not to be performed.
Z0M/Z1 Angle
Range: –90 to 90° in steps of 1
Default: 0°
This setting specifies the angle difference between the mutual zero-sequence
impedance between the lines and the positive-sequence impedance of the protected
line.
Reach
Range: 0.02 to 500.00 ohms in steps of 0.01
Default: 2.00 ohms
This setting specifies the reach of the zone for the forward and reverse applications. In
non-directional applications, this setting defines the forward reach of the zone. The
reverse reach impedance in non-directional applications is set independently. The angle
of the reach impedance is entered as the
RCA setting. The reach impedance is entered in
secondary ohms.
RCA
Range: 30 to 90° in steps of 1
Default: 85°
This setting specifies the characteristic angle (similar to the maximum torque angle in
previous technologies) of the ground distance characteristic for the forward and reverse
applications. In the non-directional applications, this setting defines the forward reach
of the zone. The reverse reach impedance in the non-directional applications is set
independently. This setting is independent from the
Directional RCA setting (the
characteristic angle of an extra directional supervising function).
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