Schweitzer Engineering Laboratories SEL-421-4 - Figure 5.58 Zone 2 Mho Ground-Distance Element Logic Diagram

5.75
Date Code 20171021 Instruction Manual SEL-421 Relay
Protection Functions
Mho Ground-Distance Elements
Figure 5.58 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