Schweitzer Engineering Laboratories SEL-421-4 - Figure 5.57 Zone 1 Mho Ground-Distance Element Logic Diagram

5.74
SEL-421 Relay Instruction Manual Date Code 20171021
Protection Functions
Mho Ground-Distance Elements
Figure 5.57 Zone 1 Mho Ground-Distance Element Logic Diagram
—
+
—
+
y
Word
Bits
Relay
Word
Bits
Relay
Word
Bit
Relay
Word
Bits
32SPOF
CVTBL
MAG1
MBG1
Z1G
MCG1
XAG1
XBG1
XCG1
32GF
IAL
IGL
mAGF < Z1MG
FSA
SPO
SPOA
OSB1
OSBA
3PO
67Q1T
ILOP
VPOLV
SERCA
0.1 • I
NOM
mAGF A-Phase-to-Ground
Mho Distance Calculation
A-Phase Mho Ground Distance Logic
B- and C-Phase Logic is Similar
Z50G1
(setting)