Schweitzer Engineering Laboratories SEL-421-4 - Figure 5.22 Best Choice Ground Directional Element Logic

5.40
SEL-421 Relay Instruction Manual Date Code 20171021
Protection Functions
Ground Directional Element
q From Figure 5.20 , w From Figure 5.21 , e To Figure 5.23 , r To Figure 5.24 , t To
Figure 5.25
Figure 5.22 Best Choice Ground Directional Element Logic
Directional Element
Priority (setting)
ORDER
32QGE
position 1
internal enable
asserted?
N
Y
Y
N
Y
N
N
Y
Y
N
Direction
Element Enables
(Relay Word Bits)
32VE
32IE
ORDER =
1 2 or
1 2 3?
position 2
internal enable
asserted?
no ground
directional
element
enabled
ORDER =
1 2 3 ?
position 3
internal enable
asserted?
Best Choice Ground
Directional enable output
Enable ground directional
element that corresponds
to position 1 internal enable
ORDER = 1,
1 2,
or 1 2 3
where any combination of Q,
V, and I are set in positions 1,
2, or 3 for ground directional
element priority.
Q: 32QGE
V: 32VE
I: 32IE
32QGE
32VE
32IE
Best Choice Ground
Directional enable output
Enable ground directional
element that corresponds
to position 2 internal enable
32QGE
32VE
32IE
Best Choice Ground
Directional enable output
Enable ground directional
element that corresponds
to position 3 internal enable
32QGE
32VE
32IE
e
r
t
e
r
t
e
r
t
q
w