SETTINGS SHEET Page 14 of 24
FOR THE SEL-351 RELAY Date
SELOGIC CONTROL EQUATION SETTINGS (SERIAL PORT COMMAND SET L)
Date Code 20001006
SELOGIC Control Equation settings consist of Relay Word bits (see Table 9.3) and SELOGIC
Control Equation operators * (AND), + (OR), ! (NOT), / (rising edge), \ (falling edge), and ( )
(parentheses). Numerous SELOGIC Control Equation settings examples are given in Section 3
through Section 8. SELOGIC Control Equation settings can also be set directly to 1 (logical 1) or 0
(logical 0). Appendix G: Setting SELOGIC Control Equations gives SELOGIC Control Equation
details, examples, and limitations.
Trip Logic Equations (See Figure 5.1)
Other trip conditions TR =
Communications-assisted trip conditions TRCOMM =
Switch-onto-fault trip conditions TRSOTF =
Direct transfer trip conditions DTT =
Unlatch trip conditions ULTR =
Communications-Assisted Trip Scheme Input Equations
Permissive trip 1 (used for ECOMM = POTT, DCUB1,
or DCUB2; see Figures 5.5, 5.7, and 5.10)
PT1 =
Loss-of-guard 1 (used for ECOMM = DCUB1 or
DCUB2; see Figure 5.10)
LOG1 =
Permissive trip 2 (used for ECOMM = DCUB2; see
Figures 5.5 and 5.10)
PT2 =
Loss of guard 2 (used for ECOMM = DCUB2; see
Figure 5.10)
LOG2 =
Block trip (used for ECOMM = DCB; see Figure 5.14) BT =
Close Logic Equations (See Figure 6.1))
Circuit breaker status (used in Figure 5.3, also) 52A =
Close conditions (other than automatic reclosing or
CLOSE command)
CL =
Unlatch close conditions ULCL =
Reclosing Relay Equations (See Reclosing Relay in Section 6)
Reclose initiate 79RI =
Reclose initiate supervision 79RIS =
Drive-to-lockout 79DTL =
Drive-to-last shot 79DLS =
Skip shot 79SKP =
Stall open interval timing 79STL =
Block reset timing 79BRS =
Sequence coordination 79SEQ =
Reclose supervision (see Figure 6.2) 79CLS =
Courtesy of NationalSwitchgear.com
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