Schweitzer Engineering SEL-351P - Page 471

S ETTINGS S HEET Page 13 of 23
F OR THE SEL-351P R ECLOSER C ONTROL Date
SEL OGIC C ONTROL E QUATION S ETTINGS (S ERIAL P ORT C OMMAND SET L)
Date Code 990215
SEL OGIC Control Equation settings consist of Relay Word bits (see Table 9.3) and SEL OGIC
Control Equation operators * (AND), + (OR), ! (NOT), / (rising edge), \ (falling edge), and ( )
(parentheses). Numerous SEL
OGIC Control Equation settings examples are given in Section 1,
and 3 through 8. SEL
OGIC Control Equation settings can also be set directly to 1 (logical 1) or 0
(logical 0). Appendix G: Setting SEL
OGIC Control Equations gives SEL OGIC 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 =