4.111
Date Code 20170814
Instruction Manual
SEL-700G Relay
Protection and Logic Functions
Group Settings (SET Command)
Figure 4.78
Zero-Sequence Voltage-Polarized Directional Element for
Residual-Ground Overcurrent Elements
q
From Table 4.28
w
To Figure 4.81
e
From Figure 4.75
I
0
V
0
If Z0F Setting
>
0, Forward Threshold = 1.25 • Z0F — 0.25 •
I
0
V
0
If Z0F Setting
≤
0, Forward Threshold = 0.75 • Z0F — 0.25 •
Forward Threshold:
I
0
V
0
If Z0R Setting
<
0, Reverse Threshold = 1.25 • Z0R + 0.25 •
I
0
V
0
If Z0R Setting
≥
0, Reverse Threshold = 0.75 • Z0R + 0.25 •
Reverse Threshold:
Direction Element Characteristics
R0
X0
Forward Threshold
Reverse Threshold
Z0 PLANE
DIRVE is highest
RDIRV
(Reverse)
FDIRV
(Forward)
Best Choice
Ground
Directional
Logic
50GF
Enable
Forward
Threshold
DIRVE
Reverse
Threshold
50GR
Re[3V
0
•(I
G
•1
∠
Z0MTA)*]
|I
G
|
2
Z0 =
I
G
3V
0
Relay
Word
Bits
Relay
Word
Bit
Relay
Word
Bit
Relay
Word
Bit
choice that is asserted
(I
G
= 3I
0
)
(Residual)
1
2
3
3
3
Содержание SEL-700G Series
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