GE L60 Instruction Manual page 219

5 SETTINGS
Figure 5–57: DIRECTIONAL QUADRILATERAL GROUND DISTANCE CHARACTERISTIC
Figure 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 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.
• 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 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 under the
zero-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.
GE Multilin
X
COMP LIMIT COMP LIMIT
DIR COMP LIMIT
RCA
LFT BLD RCA
-LFT BLD
X
COMP LIMIT COMP LIMIT
LFT BLD RCA RCA
-LFT BLD
REV REACH
RCA
COMP LIMIT COMP LIMIT
"-" NON-HOMOGEN. ANG
"+" NON-HOMOGEN. ANG
. This setting specifies the ratio between the magnitudes of the mutual
DISTANCE SOURCE
L60 Line Phase Comparison Relay
"+" NON-HOMOGEN. ANG
"-" NON-HOMOGEN. ANG
DIR COMP LIMIT
DIR RCA
RGT BLD RCA
RGT BLD
837769A1.CDR
"+" NON-HOMOGEN. ANG
"-" NON-HOMOGEN. ANG
RGT BLD RCA
RGT BLD
837770A1.CDR
5.5 GROUPED ELEMENTS
R
R
5-117
5