13.6
SEL-400 Series Relays Instruction Manual Date Code 20171006
SELOGIC Control Equation Programming
SEL
OGIC Control Equation Programming
SELOGIC Control Equation Programming
There are two major areas where SEL-400 series relays use SELOGIC control
equations. First, fixed SEL
OGIC control equations define the operation of fixed
protection elements or outputs. As with SEL-300 series relay programming, pro-
tection programming and outputs use fixed SEL
OGIC control equations. Second,
you can use freeform SEL
OGIC control equations for freeform programming that
includes mathematical operations, custom logic execution order, extended relay
customization, and automated operation.
Fixed SELOGIC Control Equations
Fixed result SELOGIC control equations are equations in which the left side
(result storage location), or LVALUE, is fixed. Programming in SEL-300 series
relays consists of all fixed SEL
OGIC control equations. Fixed equations include
protection and output settings that you set with SEL
OGIC control equations.
Fixed SEL
OGIC control equations are Boolean equations. Fixed result control
equations can be as simple as a single element reference (for example PSV01) or
can include a complex equation. An example of fixed programming is shown in
Example 13.1.
Freeform SELOGIC Control Equations
Freeform SELOGIC control equations provide advanced relay customization and
automation programming. There are freeform SEL
OGIC control equation pro-
gramming areas used for protection and automation. You can use freeform
SEL
OGIC control equation programming to enter program steps sequentially so
that the relay will perform steps in the order that you specify. You can refer to
storage locations multiple times and build up intermediate results in successive
Example 13.1 Fixed SELOGIC Control Equations
The following equations are examples of fixed SELOGIC control equations
for relay Output OUT101. The text after the # character is a comment
included in the equation and stored in the relay for future reference and doc-
umentation.
OUT101 := 1 # Turn on OUT101
OUT101 := NA # Do not evaluate an equation for OUT101
OUT101 := OUT102 AND RB02 # Turn on OUT101 if OUT102 and
RB02 are on
Fixed SEL
OGIC control equations include expressions that evaluate to a
Boolean value, True or False, represented by a logical 1 or logical 0.
OUT101 := PSV04 # Turn on OUT101 if protection PSV04 is on
More complex programming in the freeform area controls OUT101. The
result of the freeform programming is available as an element in a fixed
equation.
OUT101 := AMV003 > 5 # Turn on OUT101 if AMV003 is greater than 5
While you cannot perform mathematical operations in fixed programming,
you can perform comparisons on the results of mathematical operations per-
formed elsewhere.
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