5-122 D30 Line Distance Protection System GE Multilin5.6 GROUPED ELEMENTS 5 SETTINGS5Figure 5–57: DIRECTIONAL QUADRILATERAL GROUND DISTANCE CHARACTERISTICFigure 5–58: NON-DIRECTIONAL QUADRILATERAL GROUND DISTANCE CHARACTERISTIC• GND DIST Z1 Z0/Z1 MAG: This setting specifies the ratio between the zero-sequence and positive-sequence imped-ance 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.• GND DIST Z1 Z0/Z1 ANG: 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 isthe 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.• GND DIST Z1 ZOM/Z1 MAG: 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 parallelline (3I_0) measured in the direction of the zone being compensated must be connected to the ground input CT of theCT bank configured under the DISTANCE SOURCE. This setting specifies the ratio between the magnitudes of the mutualzero-sequence impedance between the lines and the positive-sequence impedance of the protected line. It is impera-tive to set this setting to zero if the compensation is not to be performed.837769A1.CDRXRREACHRCADIR RCADIR COMP LIMITDIR COMP LIMITCOMP LIMITCOMP LIMITRGT BLD RCALFT BLD RCARGT BLD-LFT BLD"+" NON-HOMOGEN. ANG"-" NON-HOMOGEN. ANG837770A1.CDRXRREACHRCA RGT BLD RCALFT BLD RCARGT BLD-LFT BLDREV REACHREV REACHRCACOMP LIMITCOMP LIMIT"-" NON-HOMOGEN. ANG"+" NON-HOMOGEN. ANGCOMP LIMIT COMP LIMIT"-" NON-HOMOGEN. ANG"+" NON-HOMOGEN. ANG
