GE D30 Instruction Manual page 301

CHAPTER 5: SETTINGS
Figure 5-88: Directional quadrilateral ground distance characteristic
Figure 5-89: Non-directional quadrilateral ground distance characteristic
— This setting specifies the ratio between the zero-sequence and positive-sequence impedance
GND DIST Z1 Z0/Z1 MAG
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.
— This setting specifies the angle difference between the zero-sequence and positive-sequence
GND DIST Z1 Z0/Z1 ANG
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.
— The ground distance elements can be programmed to apply compensation for the zero-
GND DIST Z1 ZOM/Z1 MAG
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
sequence impedance between the lines and the positive-sequence impedance of the protected line. Set this setting to zero
if the compensation is not to be performed. Note that internally the mutual coupling compensation is applied only if
D30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
X
COMP LIMIT COMP LIMIT
DIR COMP LIMIT
LFT BLD RCA 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 zero-
"+" 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
GROUPED ELEMENTS
R
R
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