Sel SEL-421 - Best Choice Ground Directional Logic

R.1.33
Date Code 20111215 Reference Manual SEL-421 Relay
Protection Functions
Ground Directional Element
Figure 1.20 Best Choice Ground Directional Logic
q From Figure 1.18, w From Figure 1.19, e To Figure 1.21, r To Figure 1.22, t To
Figure 1.23
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