Schweitzer Engineering Laboratories SEL-311C - Page 346

SET.16 of 32 Settings Sheets for the SEL-311C Relay
SEL
OGIC Control Equation Settings (Serial Port Command SET L)
SEL-311C Relay Instruction Manual Date Code 20060320
Date________________
SELOGIC Control Equation Settings
(Serial Port Command SET L)
SELOGIC control equation settings consist of Relay Word bits (see Table 9.5 and Table 9.6) and SELOGIC
control equation operators * (AND), + (OR), ! (NOT), / (rising edge), \ (falling edge), and ( ) (parentheses).
Numerous SEL
OGIC 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 H: Setting SEL
OGIC
Control Equations gives SEL
OGIC control equation details, examples, and limitations.
Trip Logic Equations (See Figure 5.1)
Direct 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 Figure 5.5, Figure 5.7, and Figure 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 Figure 5.5 and Figure 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 on page 6.11)
Reclose initiate 79RI =
Reclose initiate supervision
79RIS =
Drive-to-lockout
79DTL =
Drive-to-last shot 79DLS =
Skip shot
79SKP =
Stall open interval timing
79STL =