Schweitzer Engineering Laboratories SEL-700G Series, Instruction Manual

Page: 221 / 824

4.115
Date Code 20170814 Instruction Manual SEL-700G Relay
Protection and Logic Functions
Group Settings (SET Command)
Figure 4.83 Direction Forward/Reverse Logic for Residual-Ground
Overcurrent Elements
Figure 4.84 Direction Forward/Reverse Logic for Neutral-Ground
Overcurrent Elements
Directional Control for Negative-Sequence and Phase Overcurrent
Elements.
The directional control for overcurrent elements is enabled by making
directional control enable setting EDIR. Setting EDIR and other directional control
settings are described in Directional Control Settings on page 4.121.
The negative-sequence voltage-polarized directional element controls the
negative-sequence overcurrent elements. Negative-sequence voltage-polarized
and positive-sequence voltage-polarized directional elements control the
phase overcurrent elements. Figure 4.85 gives an overview of how the
q
From Figure 4.81
w
To Figure 4.61
e
To Figure 4.54
q
From Figure 4.82
w
To Figure 4.60
e
To Figure 4.56
Level
Direction
Settings
Directional
Control
DIRGF
DIR1 = F
DIR1 = N
Relay
Word
Bits
to Residual Ground
Time-0vercurrent
Elements
to Residual Ground
Instantaneous/
Definite-TIme
Overcurrent
Elements
ORDER = OFF
Setting
Forward
Forward
DIRGR
Reverse
Level 1
DIR1 = R
Reverse
DIR2 = F
DIR2 = N
Forward
Level 2
DIR2 = R
Reverse
1
2
3
1
GX1DIR
GY1DIR
GX2DIR
GY2DIR
Level
Direction
Settings
Directional
Control
DIRNF
DIR1 = F
DIR1 = N
Relay
Word
Bits
to Neutral Ground
Time-0vercurrent
Elements
to Neutral Ground
Instantaneous/
Definite-TIme
Overcurrent
Elements
ORDER = OFF
Setting
Forward
Forward
DIRNR
Reverse
Level 1
DIR1 = R
Reverse
DIR2 = F
DIR2 = N
Forward
Level 2
DIR2 = R
Reverse
1
2
3
1
NX1DIR
NX2DIR