Schweitzer Engineering Laboratories SEL-421-4 - Figure 5.35 OOS Logic Diagram

5.55
Date Code 20171021 Instruction Manual SEL-421 Relay
Protection Functions
Out-of-Step Logic (Conventional)
Figure 5.35 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 OSTI OST OST0 OSB1 OOSDET OSB2 OSB3 OSB4 OSB5
Reset Takes
Priority
OOS Detected After
0
1 SEC