GE D30 Instruction Manual page 200

5.5 GROUPED ELEMENTS
5
SETTINGS
GND DIST Z1 FUNCTION:
Disable=0
Enable=1
SETTING
GND DIST Z1 BLK:
Off=0
SETTING
DISTANCE SOURCE:
IA
IB
IC
VT CONNECTION
WYE DELTA
VAG-VBG VAB
VBC
VBG-VCG
VCG-VAG VCA
I_2
I_0
V_1
I_1
IN
GROUND DIRECTIONAL SUPERVISION:
A dual (zero and negative-sequence) memory-polarized directional supervision applied to the ground distance protection
elements has been shown to give good directional integrity. However, a reverse double-line-to-ground fault can lead to a
maloperation of the ground element in a sound phase if the zone reach setting is increased to cover high resistance faults.
Ground distance zones 2 through 3 use an additional ground directional supervision to enhance directional integrity. The
element's directional characteristic angle is used as a 'maximum torque angle' together with a 90° limit angle.
The supervision is biased toward operation in order to avoid compromising the sensitivity of ground distance elements at
low signal levels. Otherwise, the reverse fault condition that generates concern will have high polarizing levels so that a cor-
rect reverse fault decision can be reliably made.
5-102
SETTINGS
GND DIST Z1 DIR:
GND DIST Z1 SHAPE:
GND DIST Z1 Z0/Z1 MAG:
GND DIST Z1 Z0/Z1 ANG:
GND DIST Z1 Z0M/Z1 MAG:
GND DIST Z1 Z0M/Z1 ANG:
GND DIST Z1 REACH:
GND DIST Z1 RCA:
GND DIST Z1 REV REACH
GND DIST Z1 REV REACH RCA:
GND DIST Z1 POL CURRENT:
GND DIST Z1
NON-HOMOGEN ANG:
GND DIST Z1 COMP LIMIT:
GND DIST Z1 DIR RCA:
GND DIST Z1
DIR COMP LIMIT:
GND DIST Z1 VOLT
LEVEL:
GND DIST Z1 QUAD
RGT BLD:
AND
GND DIST Z1 QUAD
RGT BLD RCA:
GND DIST Z1 QUAD
LFT BLD:
GND DIST Z1 QUAD
LFT BLD RCA:
RUN
A ELEMENT
RUN
B ELEMENT
RUN
C ELEMENT
MEMORY
V_1 > 0.80pu
1 CYCLE
OR
I_1 > 0.025pu
SETTING
GND DIST Z1
SUPV:
RUN
IN
Figure 5–52: GROUND DISTANCE ZONE 1 TO ZONE 3 SCHEME LOGIC
D30 Line Distance Relay
QUAD ONLY
1 CYCLE
FLEXLOGIC OPERANDS
GND DIST Z1 SUPN IN
PICKUP
GND DIST Z1 DIR SUPN
5 SETTINGS
FLEXLOGIC OPERANDS
AND GND DIST Z1 PKP A
GND DIST Z1 DPO A
AND GND DIST Z1 PKP B
GND DIST Z1 DPO B
AND GND DIST Z1 PKP C
GND DIST Z1 DPO C
OR GND DIST Z1 PKP
837029A3.CDR
GE Multilin