Schweitzer Engineering Laboratories SEL-421-4 - Page 519

6.183
Date Code 20171021 Instruction Manual SEL-421 Relay
Protection Applications Examples
230 kV Tapped Transmission Line Application Example
Figure 6.55 Ladder Logic Representation, Protection Freeform SELOGIC Control Equations
>=
V1M
119.500
PSV01
PSV02
<
V1M
26.500
OUT103
>
PST01ET
120.0
R_TRIG
IN101
IN102
IN103
IN
R
PT=150.0
Q
ET
PST01
PSV02 IN101 IN102
IN103
PSV02
IN
R
PT=780
PST02
PSV02
IN103
PLT01
IN
R
PV=2
PCN01
OUT103
IN103
IN
R
PV=2
PCN02
OUT106
IN103
IN
R
PT=3600
PST03
PSV01 IN101
IN102
PLT01
S
R
PLT01
PST02Q
PLT01
PLT01
PST03Q
PST01Q
PCN01Q
R_TRIG
Q
ET
Q
CV
Q
CV
Q
ET