Sel 411L - Figure 3.127 Zone 1 Mho Phase Distance Element Logic Diagram

P.3.188
SEL-411L Relay Protection Manual Date Code 20151029
Protection Functions
Mho Phase Distance Elements
Figure 3.127 shows the Zone 1 phase distance element logic. The other fault
calculations (BC, CA) have similar logic. In Figure 3.127, Output Z1P is the
OR combination of the following Zone 1 elements (ØØ = AB, BC, CA):
➤ Conventional mho elements (MØØ1)
➤ Conventional quadrilateral elements (XØØ1)
Figure 3.127 Zone 1 Mho Phase Distance Element Logic Diagram
—
+
Relay
Word
Bits
Relay
Word
Bits
Relay
Word
Bits
—
+
—
+
IABLFM
MABDF
mABF
Z1MP
(setting)
F32P
32SPOF
SPOA
67Q1T
SPOB
SPOC
VPOLV
SERCAB
CVTBL
ILOP
OSBA
OSB1
0.1 • I
NOM
Z1P
Relay
Word
Bits
M1P
MAB1
MBC1
XBC1
XCA1
MCA1
XAB1
FSA
FSB