Date Code 20000421 Specifications 2-11
SEL-251, -2, -3 Instruction Manual
and internal logic variables, and defining the output functions. The SET command controls all
SELOGIC Control Equations programming (See Section 3: Communications). Section 5:
Applications gives several examples of implementing protection schemes with SELOGIC Control
Equations. Sample SELOGIC Control Equations are given in Example Event Report 2 in
Section 4: Event Reporting.
Figure 2.6 shows how Relay Word rows R5 and R6 in Table 2.2 and the output functions are
derived.
Assign Inputs to the Functions You Need
Program the six isolated inputs (IN1 through IN6) to the functions your application requires.
Choose from the following functions:
Default
Logic States
SS1 Setting Group Selection Input 1 (assign to IN1 only) 0
SS2 Setting Group Selection Input 2 (assign to IN2 only) 0
SS3 Setting Group Selection Input 3 (assign to IN3 only) 0
TCP External Torque Control (Phase and Negative-Sequence Elements) 1
!TCP (inverted sense of TCP) 0
TCG External Torque Control (Residual Overcurrent Elements) 1
!TCG (inverted sense of TCG) 0
52A Circuit Breaker Status (52A contact input)* N/A
!52A Circuit Breaker Status (52B contact input)* N/A
52AR Circuit Breaker Status (52A contact input)/Reclose Initiate* N/A
!52AR Circuit Breaker Status (52B contact input)/Reclose Initiate* N/A
DC Direct Close (requires circuit breaker status) 0
RE Reclose Enable (requires circuit breaker status) 1
TCM Trip Circuit Monitor (requires circuit breaker status) N/A
ET External Trigger of Event Report 0
DT Direct Trip 0
(blank) Unassigned input
∗ Only one of the circuit breaker status input options 52A, !52A, 52AR, or !52AR should
be assigned to an input.
52A or !52A
If 52A or !52A is assigned to an input, only circuit breaker status information is pro-
vided. Reclose initiation is provided by the assertion of the internal TRIP condition.
When the TRIP condition drops out and the circuit breaker is open (per 52A or !52A),
the open interval starts timing.
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