Sel SEL-421 - Zone 1 Mho Phase Distance Element Logic Diagram

R.1.59
Date Code 20111215 Reference Manual SEL-421 Relay
Protection Functions
Mho Phase Distance Elements
Figure 1.41 Zone 1 Mho Phase Distance Element Logic Diagram
M1P Zone 1 mho phase distance elements
M2P Zone 2 mho phase distance elements
M3P Zone 3 mho phase distance elements
M4P Zone 4 mho phase distance elements
M5P Zone 5 mho phase distance elements
Table 1.47 Mho Phase Distance Elements Relay Word Bits (Sheet 2 of 2)
Name Description
—
+
Relay
Word
Bits
Relay
Word
Bits
Relay
Word
Bits
IABL
mAB < Z1P
F32P
32SPOF
SPOA
67Q1T
SPOB
FSA
FSB
SPOC
VPOLV
SERCAB
ILOP
OSBA
OSB1
0.1 • I
nom
Relay
Word
Bits
CVTBL
Relay
Word
Bit
M1P
MCA1
MBC1
MAB1
mAB is the A-Phase-to-B-Phase Mho
Distance Calculation
Zone 1 Phase Distance Logic
for AB Phase Pair is Similar to BC and CA.