Sel SEL-421 - DCUB Logic Diagram

R.1.104
SEL-421 Relay Reference Manual Date Code 20111215
Protection Functions
Directional Comparison Unblocking Scheme Logic
Figure 1.67 DCUB Logic Diagram
UBDURD
0
GARD1D
UBEND
0
0
Relay
Word
UBB2
LOG2
PT2
Loss-of-Guard Input
Permissive Trip Input
Loss-of-Guard Input
Permissiv
e Trip Input
PT1
GARD1D
0
0
UBDURD
0
UBEND
Z3RB
Settings
Logic Enabled
if Setting
Logic Enabled
ECOMM
:= DCUB1
if Setting
or
ECOMM := DCUB2
PTRX2
UBB1
PTRX1
Loss-of-Channel
Loss-of-Channel
Relay
Word
Bit
SEL
OGIC
Bits
ECOMM := DCUB2
LOG1
Settings
SEL
OGIC