Sel SEL-421 - Zones 3, 4, and 5 Quadrilateral Ground Distance Element Logic

R.1.57
Date Code 20111215 Reference Manual SEL-421 Relay
Protection Functions
Quadrilateral Ground Distance Elements
Figure 1.40 Zones 3, 4, and 5 Quadrilateral Ground Distance Element Logic
—
+
—
+
Relay
Word
Bit
Relay
Word
Bits
(Setting)
(Setting)
(Setting)
XGPOL := IG
32VE
Relay
Word
Bit
XAGn
32QE
32GF
XGPOL := I2
DIRn := F
XGPOL := IG
32VE
(Setting)
(Setting)
32QE
32GR
XGPOL := I2
xAGR > —XGn
—RGn < rAGR < RGn
3PO
FSA
ILOP
VPOLV
xAGF < XGn
—RGn < rAGF < RGn
0.1 • I
nom
IGL
IAL
SPO
(Relay Word Bit)
Zone 3, 4, and 5 Quadrilateral Ground
Distance Logic for A-phase.
B- and C-Phase Logic Is Similar.
n = 3, 4, or 5
Relay
Word
Bit
Relay
Word
Bits
Relay
Word
Bits