
5-172
L90 Line Current Differential System
GE Multilin
5.6 GROUPED ELEMENTS
5 SETTINGS
5
Figure 5–77: DIRECTIONAL QUADRILATERAL GROUND DISTANCE CHARACTERISTIC
Figure 5–78: 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
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.
837769A1.CDR
X
R
RE
A
C
H
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
R
EAC
H
RCA
RGT BLD RCA
LFT BLD RCA
RGT BLD
-LFT BLD
RE
V
RE
ACH
RE
V
REACH
RCA
COMP LIMIT
COMP LIMIT
"-" NON-HOMOGEN. ANG
"+" NON-HOMOGEN. ANG
COMP LIMIT
COMP LIMIT
"-" NON-HOMOGEN. ANG
"+" NON-HOMOGEN. ANG
Summary of Contents for UR Series L90
Page 652: ...A 16 L90 Line Current Differential System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Page 772: ...B 120 L90 Line Current Differential System GE Multilin B 4 MEMORY MAPPING APPENDIX B B ...
Page 802: ...C 30 L90 Line Current Differential System GE Multilin C 7 LOGICAL NODES APPENDIX C C ...
Page 812: ...D 10 L90 Line Current Differential System GE Multilin D 1 IEC 60870 5 104 APPENDIX D D ...
Page 824: ...E 12 L90 Line Current Differential System GE Multilin E 2 DNP POINT LISTS APPENDIX E E ...
Page 834: ...F 10 L90 Line Current Differential System GE Multilin F 3 WARRANTY APPENDIX F F ...
Page 846: ...xii L90 Line Current Differential System GE Multilin INDEX ...