Sel SEL-421 - OOS Logic Diagram

R.1.48
SEL-421 Relay Reference Manual Date Code 20111215
Protection Functions
Out-of-Step Logic
Figure 1.33 OOS Logic Diagram
S
R
Q
OSBD
Reset
0
OSTD
0
0
1/8
CYC
2 SEC
0
UBOSB
X7ABC
EOOST := N
EOOST := I
X6ABC
Settings Settings
OSBLTCH := Y
Setting
Relay
Word
Bits
Relay
Word
Bits
Relay
Word
Bit
Relay
Word
Bit
EOOST := 0
OOSB1 := Y
OOSB2 := Y
OOSB3 := Y
OOSB4 := Y
OOSB5 := Y
Setting
OSB OST1 OST OST0 OSB1 OOSDET OSB2 OSB3 OSB4 OSB5
Reset Takes
Priority
OOS Detected After
3-Phase Fault
0
1 SEC