6.180
SEL-421 Relay Instruction Manual Date Code 20171021
Protection Applications Examples
230 kV Tapped Transmission Line Application Example
Figure 6.54 is a logical representation of the freeform protection SELOGIC con-
trol equations.
TMB1B Blocking signal Z3P OR Z3G OR DSTRT
TMB2B Zone 1 direct underreaching transfer trip Z1P OR Z1G
TMB3B Direct transfer trip: 86BF or 86T and MOD closed NOT IN103 AND IN104
Table 6.50 Control Outputs (SEL
OGIC Control Equations) (Sheet 2 of 2)
Setting Function Entry
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