Schweitzer Engineering Laboratories SEL-351-5, Instruction Manual

Page: 420 / 706

SET.18
of 34
SEL-351-5, -6, -7 Relay Instruction Manual
Date Code 20070117
Date________________
SEL
OGIC
Control Equation Settings
(Serial Port Command SET L)
SEL
OGIC
control equation settings consist of Relay Word bits (see Table 9.5 ) 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 3: Overcurrent, Voltage,
Synchronism Check, Frequency, and Power Elements through Section 8: Breaker Monitor, Metering,
and Load Profile Functions . SEL
OGIC
control equation settings can also be set directly to 1 (logical 1) or
0 (logical 0). Section 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 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 6.12 )
Reclose initiate 79RI =
Reclose initiate supervision 79RIS =
Drive-to-lockout 79DTL =
Drive-to-last shot 79DLS =
Skip shot 79SKP =