Schweitzer Engineering Laboratories SEL-311C - Figure 4.15 Positive-Sequence Voltage Polarized Directional Element for Phase Distance Elements

4.20
SEL-311C Relay Instruction Manual Date Code 20060320
Loss-of-Potential, CCVT Transient Detection, Load-Encroachment, and Directional Element Logic
Directional Control for Phase Distance and Negative-Sequence Elements
q From Figure 4.3; w from Figure 4.1; e to Figure 3.4, Figure 3.5, and Figure 3.6.
Figure 4.15 Positive-Sequence Voltage Polarized Directional Element for
Phase Distance Elements
0.1 •INOM
|I
A
—I
B
|
|I
B
—I
C
|
|I
C
—I
A
|
q ZLOAD
w
ILOP
VPOLV
F32P
(Forward)
R32P
(Reverse)
All Phase-Phase
Distance Elements Forward
All Phase-Phase
Distance Elements Reverse
e
Load Condition
Pos.-Seq. Polarizing
Voltage Present
Relay
Word
Bits
Internal
Elements