Date _______________
Date Code 20080213 Instruction Manual SEL-351A Relay
SET.15
of 32
SEL-351A Settings Sheets
SEL
OGIC Control Equation Settings (Serial Port Command SET L)
SELOGIC Control Equation Settings
(Serial Port Command SET L)
SELOGIC control equation settings consist of Relay Word bits (see Table 9.5 ) 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: Overcurrent, Voltage,
Synchronism Check, and Frequency Elements through Section 8: Breaker Monitor and Metering.
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 SELOGIC control equation details, examples, and
limitations.
Trip Logic Equations (See Figure 5.1)
Other trip conditions TR =
Switch-onto-fault trip conditions
TRSOTF =
Direct transfer trip conditions
DTT =
Unlatch trip conditions
ULTR =
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 6.12)
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 =
Latch Bits Set/Reset Equations (See Figure 7.11)
Set Latch Bit LT1 SET1 =
Reset Latch Bit LT1
RST1 =
Set Latch Bit LT2
SET2 =
Courtesy of NationalSwitchgear.com
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