Schweitzer Engineering Laboratories SEL-421-4 - Page 303

5.143
Date Code 20171021 Instruction Manual SEL-421 Relay
Protection Functions
Trip Logic
Figure 5.99 Trip Logic Diagram (Continued)
0
TDURD
RESET
RESET
RESET
SPT
3PT
TPA
TPB
TPC
ULTRA
ATPA
TRPRM
A3PT
ATPB
ATPC
TRIP
ULTRB
ULTRC
ULTR
RSTTRGT
0
TDURD
0
TDURD