Schweitzer Engineering Laboratories SEL-351A - Figure 4.21 Positive-Sequence Voltage-Polarized Directional Element for Phase Overcurrent Elements

4.34
SEL-351A Relay Instruction Manual Date Code 20080213
Loss-of-Potential, Load Encroachment, and Directional Element Logic
Directional Control for Negative-Sequence and Phase Overcurrent Elements (Not in SEL-351A-1)
q From Figure 4.2; w from Figure 4.6; e from Figure 4.1; r to Figure 4.22.
Figure 4.21 Positive-Sequence Voltage-Polarized Directional Element for
Phase Overcurrent Elements
50P32P • 3
50P32
|I
A
—I
B
|
|I
B
—I
C
|
|I
C
—I
A
|
ELOP = Y or Y1
LOP
Setting
w
32QE
q
ZLOAD
VPOLV
Setting [fixed at (phase channels nominal rating) • (0.1) when enable setting ELOAD = Y]
F32P
(Forward)
R32P
(Reverse)
[90˚ + Z1ANG] > ∠Z
1
> [—90˚ + Z1ANG]
q
e
r
Z1ANG
X
1
(90˚)
(270˚)
(0˚)
(180˚)
R
1
Forward
Reverse
Loss-of-
Potential
Neg.-Seq. Dir.
Element Has Priority
Load Condition
Pos.-Seq. Polarizing Voltage Present
VNOM = -OFF
Relay
Word
Bits
Relay
Word
Bits
Courtesy of NationalSwitchgear.com