Schweitzer Engineering Laboratories SEL-421-4 - Page 520

6.184
SEL-421 Relay Instruction Manual Date Code 20171021
Protection Applications Examples
230 kV Tapped Transmission Line Application Example
Figure 6.55 Ladder Logic Representation, Protection Freeform SELOGIC Control Equations (Continued)
OUT106
>
PST04ET
300.0
IN101
IN102
IN103
IN
R
PT=330
Q
ET
PST04
PSV01 IN101 IN102
IN103 PLT01
PSV01
IN
PU=240.0
DO=0.0
Q
PCT01
IN103
25AIBK1
PLT01 IN103
59VS1
IN
PU=240.0
DO=0.0
Q
PCT02
IN103
25AIBK2 IN101
PLT01 IN103
59VS2 IN101
PLT01
PCN02Q
PST04Q