GE D30 series Instruction Manual page 243

5 SETTINGS
The distance zones can be forced to become self-polarized through the
dition (FlexLogic operand) can be configured to force self-polarization. When the selected operand is asserted (logic 1), the
distance functions become self-polarized regardless of other memory voltage logic conditions. When the selected operand
is de-asserted (logic 0), the distance functions follow other conditions of the memory voltage logic as shown below.
The distance zones can be forced to become memory-polarized through the
condition (any FlexLogic operand) can be configured to force memory polarization. When the selected operand is asserted
(logic 1), the distance functions become memory-polarized regardless of the positive-sequence voltage magnitude at this
time. When the selected operand is de-asserted (logic 0), the distance functions follow other conditions of the memory volt-
age logic.
The and
FORCE SELF-POLAR FORCE MEM-POLAR
will give higher priority to forcing self-polarization as indicated in the logic below. This is consistent with the overall philoso-
phy of distance memory polarization.
The memory polarization cannot be applied permanently but for a limited time only; the self-polarization may be
applied permanently and therefore should take higher priority.
NOTE
SETTING
Force Memory Polarization
Off = 0
SETTING
| V_1 | < 1.15 pu
Distance Source
= VA, Vrms_A | Vrms – | V | | < Vrms / 8
= VB, Vrms_B | Vrms – | V | | < Vrms / 8
| Vrms – | V | | < Vrms / 8
= VC, Vrms_C
= V_1 | V_1 | > 0.80 pu
= IA | IA | < 0.05 pu
= IB | IB | < 0.05 pu
| IC | < 0.05 pu
= IC
| V_1 | < 0.10 pu
SETTING
Force Self Polarization
Off = 0
b) PHASE DISTANCE

PATH: SETTINGS GROUPED ELEMENTS
 PHASE DISTANCE Z1

MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
GE Multilin
settings should never be asserted simultaneously. If this happens, the logic
Update memory
AND RUN
TIMER
5 cycles
AND
0
TIMER
6 cycles
AND
OR
0
Figure 5–51: MEMORY VOLTAGE LOGIC
 
SETTING GROUP 1(6) DISTANCE
PHS DIST Z1
FUNCTION: Disabled
PHS DIST Z1 DIR:
Forward
PHS DIST Z1
SHAPE: Mho
PHS DIST Z1 XFMR VOL
CONNECTION: None
PHS DIST Z1 XFMR CUR
CONNECTION: None
PHS DIST Z1
REACH: 2.00 ohms
PHS DIST Z1
RCA: 85°
PHS DIST Z1 REV
REACH: 2.00 ohms
D30 Line Distance Protection System
5.6 GROUPED ELEMENTS
setting. Any user-selected con-
FORCE SELF-POLAR
setting. Any user-selected
FORCE MEM-POLAR
SETTING
Memory duration
0
AND
T
reset
S Q
AND
R
AND

PHASE DISTANCE Z1(Z5)
Range: Disabled, Enabled
Range: Forward, Reverse, Non-directional
Range: Mho, Quad
Range: None, Dy1, Dy3, Dy5, Dy7, Dy9, Dy11, Yd1, Yd3,
Yd5, Yd7, Yd9, Yd11
Range: None, Dy1, Dy3, Dy5, Dy7, Dy9, Dy11, Yd1, Yd3,
Yd5, Yd7, Yd9, Yd11
Range: 0.02 to 500.00 ohms in steps of 0.01
Range: 30 to 90° in steps of 1
Range: 0.02 to 500.00 ohms in steps of 0.01
Use V_1 memory
5
OR
Use V_1
827842A7.CDR
5-123