Sel SEL-421 - Zone 2 Mho Ground Distance Element Logic Diagram

R.1.52
SEL-421 Relay Reference Manual Date Code 20111215
Protection Functions
Mho Ground Distance Elements
Figure 1.36 Zone 2 Mho Ground Distance Element Logic Diagram
32SPOF
MAG2
MBG2
Z2G
MCG2
XAG2
XBG2
XCG2
32GF
FSA
SPO
SPOA
OSB2
OSBA
3PO
ILOP
VPOLV
A-Phase Mho Ground Distance Logic.
B- and C-Phase Logic Is Similar.
mAGF is the Forward A-Phase-to-Ground
Mho Distance Calculation.
Relay
Word
Bit
Relay
Word
Bits
Relay
Word
Bits
Relay
Word
Bits
Relay
Word
Bit
Relay
Word
Bits
—
+
—
+
IAL
IGL
mAGF < Z2MG
0.1 • I
nom