Sel 411L - Figure 3.89 Zero-Sequence Current-Polarized Directional Element Logic; Figure 3.90 Ground Directional Element Output Logic Diagram

P.3.150
SEL-411L Relay Protection Manual Date Code 20151029
Protection Functions
Ground Directional Element
Figure 3.89 Zero-Sequence Current-Polarized Directional Element Logic
q From Figure 3.84; w From Figure 3.86
Figure 3.90 Ground Directional Element Output Logic Diagram
SPO
Relay
Word
Bits
F32I
(Forward)
R32I
(Reverse)
Relay
Word
Bits
32IE
Relay
Word
Bits
50GR
Relay
Word
Bit
ILOP
50GF
IP
IGL
32IFTH
(Calculation)
32IRTH
(Calculation)
Best Choice
Ground
Directional
Logic
—
+
enable output
Enable
—
+
32I Calculation
1
2
32IE
LOP
Word
Bits
F32QG
F32V
F32I
32SPOF
32SPOR
Relay
Word
Bits
Relay
Word
Bits
32GF
32GR
Relay
Word
Bit
Relay
Word
Bit
R32QG
R32V
R32I
ELOP := Y
Setting
HSDGR
HSDGF
Table 3.78 Reference Table for Figure 3.87–Figure 3.89
Name Description
z2 Negative-sequence voltage-polarized directional element impedance calculation
Z2FTH Negative-sequence voltage-polarized directional element forward threshold calculation
Z2RTH Negative-sequence voltage-polarized directional element reverse threshold calculation
z0 Zero-sequence voltage-polarized directional element impedance calculation
Z0FTH Zero-sequence voltage-polarized directional element forward threshold calculation
Z0RTH Zero-sequence voltage-polarized directional element reverse threshold calculation
32I Zero-sequence current-polarized directional element calculation
32IFTH Zero-sequence current-polarized directional element forward threshold calculation
32IRTH Zero-sequence current-polarized directional element reverse threshold calculation