Schweitzer Engineering Laboratories SEL-311C - Figure 4.11 Channel IP Current-Polarized Directional Element for Ground Distance and Residual Ground Overcurrent Elements; Figure 4.12 Ground Distance and Residual Ground Directional Logic

4.16
SEL-311C Relay Instruction Manual Date Code 20060320
Loss-of-Potential, CCVT Transient Detection, Load-Encroachment, and Directional Element Logic
Directional Control for Ground Distance and Residual Ground Overcurrent Elements
q From Figure 4.7; w from Figure 4.1; e from Figure 4.8; r to Figure 4.12.
Figure 4.11 Channel IP Current-Polarized Directional Element
for Ground Distance and Residual Ground Overcurrent Elements
q From Figure 4.1; w from Figure 4.7; e from Figure 4.9; r from Figure 4.10;
t from Figure 4.11; y to Figure 3.7–Figure 3.12 and Figure 3.22.
Figure 4.12 Ground Distance and Residual Ground Directional Logic
Forward Threshold = (Channel I
P
Nominal Rating) • (Phase Channels Nominal Rating) • (0.05)
2
Forward Threshold:
Reverse Threshold = —(Channel I
P
Nominal Rating) • (Phase Channels Nominal Rating) • (0.05)
2
Reverse Threshold:
enable
output e
R32I
(Reverse)
F32I
(Forward)
Best Choice
Ground
Directional
Logic
q 50GF
Enable
Forward
Threshold
q 32IE
w ILOP
Reverse
Threshold
q 50GR
Re[I
G
•I
P
*]
I
G
I
P
Relay
Word
Bits
Relay
Word
Bit
Relay
Word
Bits
Relay
Word
Bit
(I
G
= 3I
0
)
(Residual)
r
LOP
Relay
Word
Bits
F32QG
R32QG
w 32IE
32GF
(Forward) y
32GR
(Reverse) y
Relay
Word
Bits
Setting
ELOP = Y
e
F32V
R32V
Loss-of-Potential
F32I
R32I
q
r
t