9328900990 Rev L BE1-951 Application 8-31
FDR-W-IL Logic Settings and Equations
SL-N=FDR-W-IL
SL-50TP=1,79SCB; SL-50TN=1,243+79SCB+/IN3; SL-50TQ=1,243+79SCB+/IN3
SL-150TP=1,0; SL-150TN=1,0; SL-150TQ=1,0
SL-51P=1,0
SL-51N=1,243+/IN3
SL-51Q=1,243+/IN3
SL-151N=0,0
SL-24=0,0
SL-25=0,0
SL-27P=0,0; SL-27X=0,0
SL-47=0,0
SL-59P=0,0; SL-59X=0,0
SL-159X=0,0
SL-81=0,0
SL-181=0,0
SL-281=0,0
SL-381=0,0
SL-481=0,0
SL-581=0,0
SL-32=0,0
SL-62=0,0,0
SL-162=0,0,0
SL-79=1,VO8,/IN1,VO12,VO9+VO15
SL-86=0,0,0
SL-186=0,0,0
SL-BF=1,VO10,VO15
SL-GROUP=1,0,0,0,0,/43
SL-43=2
SL-143=2
SL-243=2
SL-343=2
SL-101=1
SL-VOA=0
SL-VO1=BFPU+VO11+101T
SL-VO2=79C+101C
SL-VO3=/VO15
SL-VO4=/VO5*VO12*/VO15
SL-VO5=BFT
SL-VO6=0
SL-VO7=0
SL-VO8=VO11
SL-VO9=150TPT+150TNT+150TQT+143+VO5+/IN2
SL-VO10=VO11
SL-VO11=50TPT+150TPT+50TNT+150TNT+50TQT+150TQT+51PT+51NT+51QT
SL-VO12=50TPPU+150TPPU+50TNPU+150TNPU+50TQPU+150TQPU+51PPU+51NPU+51QPU
SL-VO13=0
SL-VO14=0
SL-VO15=343+/IN4
BUS AND BACKUP LOGIC SCHEMES
Logic schemes BUS and BACKUP are intended for use on a bus main breaker and they provide all
overcurrent protection and control functions required for a typical bus main breaker in a nondirectional
overcurrent protection application. When used with other programmable relays using the FDR-W-IL
scheme, BUS and BACKUP logic provide complete overcurrent protection for the transformers, bus, and
feeders in a radial system substation.
Interconnection of a relay using FDR-W-IL logic with relays using BUS and BACKUP logic provides
complete backup protection (except for reclosing) for the feeder relays if they are out of service for testing
or maintenance.
Figure 8-9 illustrates how FDR-W-IL, BUS, and BACKUP relays are interconnected to
achieve this integrated protection system.
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