Sel SEL-421 - Zone 2 Quadrilateral Distance Element Logic Diagram

R.1.56
SEL-421 Relay Reference Manual Date Code 20111215
Protection Functions
Quadrilateral Ground Distance Elements
Figure 1.39 Zone 2 Quadrilateral Distance Element Logic Diagram
Relay
Word
Bits
Relay
Word
Bits
Relay
Word
Bit
(Setting)
(Setting)
XAG2
XGPOL := IG
32VE
32QE
32GF
XGPOL := I2
IAL
IGL
xAGF < XG2
– RG2 < rAGF < RG2
0.1 • I
nom
FSA
SPO
B- and C-Phase Logic Is Similar.
xAGF is the A-Phase-to-Ground Forward Reactance Calculation.
rAGF is the A-Phase-to-Ground Forward Resistance Calculation.
+
—
+
—
3PO
ILOP
VPOLV