Sel SEL-421 - Ground Directional Element Output Logic Diagram

R.1.35
Date Code 20111215 Reference Manual SEL-421 Relay
Protection Functions
Ground Directional Element
Figure 1.23 Zero-Sequence Current-Polarized Directional Element Logic
q From Figure 1.18; w From Figure 1.20
Figure 1.24 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
Relay
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