GE T60

5-194 T60 Transformer Protection System GE Multilin
5.6 GROUPED ELEMENTS 5 SETTINGS
5
The directional and non-directional quadrilateral ground distance characteristics are shown below. The directional and
non-directional mho ground distance characteristics are the same as those shown for the phase distance element in
the previous sub-section.
Figure 5–82: DIRECTIONAL QUADRILATERAL GROUND DISTANCE CHARACTERISTIC
Figure 5–83: 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
DISTANCE SOURCE. This setting specifies the ratio between the magnitudes of the mutual
837769A1.CDR
X
R
REACH
RCA
DIR RCA
DIR COMP LIMIT
DIR COMP LIMIT
COMP LIMIT
COMP LIMIT
RGT BLD RCA
LFT BLD RCA
RGT BLD
-LFT BLD
"+" NON-HOMOGEN. ANG
"-" NON-HOMOGEN. ANG
837770A1.CDR
X
R
REACH
RCA
RGT BLD RCA
LFT BLD RCA
RGT BLD
-LFT BLD
RE
V
REACH
REV REACH
RCA
COMP LIMIT
COMP LIMIT
"-" NON-HOMOGEN. ANG
"+" NON-HOMOGEN. ANG
COMP LIMIT
COMP LIMIT
"-" NON-HOMOGEN. ANG
"+" NON-HOMOGEN. ANG