Schweitzer Engineering Laboratories SEL-421-4 - Figure 5.44 Dependable Power-Swing Block Detector Logic (EOOS = Y1)

5.64
SEL-421 Relay Instruction Manual Date Code 20171021
Protection Functions
Out-of-Step Logic (Zero Settings)
Figure 5.44 Dependable Power-Swing Block Detector Logic (EOOS = Y1)
DIR5 = F
DIR4 = F
Z5P
Z4P
Z3P
Z2P
OSB
OSB1
TRIP
SERCAB
SERCBC
MAB1I
XAB1I
MBC1I
XBC1I
SERCCA
MCA1I
XCA1I
MAB2I
XAB2I
MBC2I
XBC2I
MCA2I
XCA2I
Z1MAG
FZAVG
| Z1F
k
— Z1F
k — 1
| • 8 • NFREQ
| d2SCV1_UF |
2 • d2SCV1_UF_avg + 0.06
DIR3 = F
0
0.25
CYC
0
0.25
CYC
0
0.25
CYC
0.25
CYC
0
0
0.25
CYC
0
2.5
CYC
0
0.125
CYC
1.5
CYC
0
0
2.5
CYC
DOSBY1
0
1.5
CYC
0
60
CYC
1