Schweitzer Engineering SEL-351P - Determination of Number of Reclosures (Last Shot); Observe Shot Counter Operation

6-16 Close and Reclose Logic Date Code 990215
SEL-351P Manual Técnico
timing. If the subsequent second reclosure is not successful, the relay goes to the Lockout State.
See the example time line in
Figure SECTION 6: .6.
Figure SECTION 6: .6: Reclosing Sequence from Reset to Lockout with Example
Settings
Note: Open intervals should not be set less than 30 cycles, otherwise the control will go to
lockout prematurely.
SEL
OGIC Control Equation setting 79STL (stall open interval timing) can be set to control open
interval timing [see Skip Shot and Stall Open Interval Timing Settings (79SKP and 79STL,
respectively) later in this subsection].
Determination of Number of Reclosures (Last Shot)
The number of reclosures is equal to the number of open interval time settings that precede the
first open interval time setting set equal to zero. The “last shot” value is also equal to the number
of reclosures.
In the above factory settings, three set open interval times precede open interval 4 time, which is
set to zero (79OI4 = 0.00):
79OI1 = 300.00
79OI2 = 600.00
79OI3 = 600.00
790I4 = 0.00
For this example:
Number of reclosures (last shot) = 3 = the number of set open interval times that precede the
first open interval set to zero.
Observe Shot Counter Operation
Observe the reclosing relay shot counter operation, especially during testing, with the front-panel
shot counter screen (accessed via the OTHER pushbutton). See Functions Unique to the Front-
Panel Interface in Section 11: Additional Front-Panel Interface Details.