4.118
SEL-700G Relay
Instruction Manual
Date Code 20170814
Protection and Logic Functions
Group Settings (SET Command)
Directional Control Provided by Torque Control Settings on page 4.133
describes how to avoid this limitation for special cases.
Figure 4.86
Negative-Sequence Voltage-Polarized Directional Element for
Negative-Sequence and Phase Overcurrent Elements
q
To Figure 4.88
w
From Figure 4.74
I
2
V
2
If Z2F Setting
>
0, Forward Threshold = 1.25 • Z2F — 0.25 •
I
2
V
2
If Z2F Setting
≤
0, Forward Threshold = 0.75 • Z2F — 0.25 •
Forward Threshold:
I
2
V
2
If Z2R Setting
<
0, Reverse Threshold = 1.25 • Z2R + 0.25 •
I
2
V
2
If Z2R Setting
≥
0, Reverse Threshold = 0.75 • Z2R + 0.25 •
Reverse Threshold:
Direction Element Characteristics
R2
X2
Forward Threshold
Reverse Threshold
Z2 PLANE
RDIRQ
(Reverse)
FDIRQ
(Forward)
50QF
Enable
Forward
Threshold
Reverse
Threshold
50QR
Re[V
2
•(I
2
•1
∠
Z1ANG)*]
|I
2
|
2
Z2 =
I
2
V
2
Relay
Word
Bits
Relay
Word
Bit
DIRQE
Relay
Word
Bits
Relay
Word
Bit
1
2
2
2
Summary of Contents for SEL-700G Series
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