GE D60 Instruction Manual page 174

5.5 GROUPED ELEMENTS
Figure 5–51: 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-
5
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.
• GND DIST Z1 ZOM/Z1 ANG: This setting specifies the angle difference between the mutual zero-sequence imped-
ance between the lines and the positive-sequence impedance of the protected line.
• GND DIST Z1 REACH: This setting defines 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-direc-
tional applications is set independently. The angle of the reach impedance is entered as the
The reach impedance is entered in secondary ohms.
• GND DIST Z1 RCA: 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
angle of an extra directional supervising function).
The relay internally performs zero-sequence compensation for the protected circuit based on the values
entered for
NOTE pensation for mutual coupling based on the values entered for
(see Chapter 8 for details). The
ANG
terms of positive sequence quantities.
5-90
X
COMP LIMIT
LFT BLD RCA
-LFT BLD
REV REACH
RCA
COMP LIMIT
"-" NON-HOMOGEN. ANG
"+" NON-HOMOGEN. ANG
. This setting specifies the ratio between the magnitudes of the mutual
DISTANCE SOURCE
and
GND DIST Z1 Z0/Z1 MAG GND DIST Z1 Z0/Z1 ANG
GND DIST Z1 REACH
D60 Line Distance Relay
"+" NON-HOMOGEN. ANG
"-" NON-HOMOGEN. ANG
COMP LIMIT
RCA
RGT BLD RCA
COMP LIMIT
GND DIST Z1 DIR RCA
, and if configured to do so, zero-sequence com-
GND DIST Z1 Z0M/Z1 MAG
and
GND DIST Z1 RCA
5 SETTINGS
R
RGT BLD
837770A1.CDR
GND DIST Z1 RCA
setting (the characteristic
and
GND DIST Z1 Z0M/Z1
should, therefore, be entered in
GE Multilin
setting.