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

R.1.60
SEL-421 Relay Reference Manual Date Code 20111215
Protection Functions
Mho Phase Distance Elements
Figure 1.42 Zone 2 Mho Phase Distance Element Logic Diagram
F32P
32SPOF
MBC2
MAB2
M2P
MCA2
Relay
Word
Bits
Relay
Word
Bits
Relay
Word
Bits
Relay
Word
Bits
Relay
Word
Bit
SPOA
67QUBF
SPOB
FSA
FSB
SPOC
VPOLV
ILOP
OSBA
OSB2
mAB is the A-Phase-to-B-Phase Mho
Distance Calculation
Zone 2 Phase Distance Logic for AB Phase
Pair is Similar to BC and CA.
—
+
IABL
mAB < Z2P
0.1 • I
nom