6.179
Date Code 20171021 Instruction Manual SEL-421 Relay
Protection Applications Examples
230 kV Tapped Transmission Line Application Example
Control Inputs
Connect the relay control inputs as specified in Table 6.49. This table shows the
substation equipment that each control input monitors.
Control Outputs
59: ###
60: ### SET CONDITIONING TIMER 1
61: ### SUPERVISES BK1 RECLOSING, ASSERTS IF MOD IS CLOSED AND IN SYNC. OR
62: ### MOD LATCH SET AND MOD OPEN AND BK1 BUS HOT FOR FOUR SECONDS
63: PCT01PU := 240.00 # FOUR SECOND PICKUP TIME
64: PCT01DO := 0.0 # NO DELAY ON DROPOUT
65: PCT01IN := NOT IN103 AND 25A1BK1 OR PLT01 AND IN103 AND 59VS1
66: ###
67: ### SET CONDITIONING TIMER 2
68: ### SUPERVISES BK2 RECLOSING, ASSERTS IF MOD IS CLOSED AND IN SYNC. AND BK1
69: ### CLOSED OR MOD LATCH SET AND MOD OPEN AND BK2 BUS HOT AND BK1 CLOSED
70: ### FOR FOUR SECONDS
71: PCT02PU := 240.00 # FOUR SECOND PICKUP TIME
72: PCT02DO := 0.0 # NO DELAY ON DROPOUT
73: PCT02IN := NOT IN103 AND 25A1BK2 AND NOT IN101 OR PLT01 AND IN103 AND \
59VS2 AND NOT IN101
Figure 6.53 Protection Free-Form SELOGIC Control Equations (Continued)
Table 6.49 Control Inputs
Input Monitor Condition
IN101 115 kV BK1T 52 b contact
IN102 115 kV BK2T 52 b contact
IN103 230 kV MOD b contact
IN104 Circuit breaker and autotransformer failure lockouts (86)
Table 6.50 Control Outputs (SELOGIC Control Equations) (Sheet 1 of 2)
Setting Function Entry
Main Board
OUT101 Trip BK1T TRIP
OUT102 Trip BK2T TRIP
OUT103 Trip MOD PST01ET > 120.00 AND
NOT PCN01Q
OUT104 Close BK1T BK1CL
OUT105 Close BK2T BK2CL
OUT106 Close MOD PST04ET > 300.00 AND
NOT PCN02Q
OUT107 General alarm NOT HALARM OR NOT
SALARM OR NOT ILOP
MIRRORED BITS Transmit Equations (SELOGIC Control Equations)
TMB1A Blocking signal Z3P OR Z3G OR DSTRT
TMB2A Zone 1 direct underreaching transfer trip Z1P OR Z1G
TMB3A Direct transfer trip: 86BF or 86T and MOD closed NOT IN103 AND IN104
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