9328900990 Rev L BE1-951 Protection and Control 4-63
Selecting the time units selects the time measurement that applies to all of the reclosing timers, Reset
timer, Max Cycle timer, and Reset Fail timer.
Using the pull-down menus and buttons, make the application appropriate settings to the reclosing
function.
Table 4-35 summarizes the operating settings for Reclosing.
Table 4-35. Operating Settings for Reclosing
Setting Range Increment Default
791 = 0
792 = 0
793 = 0
794 = 0
79R = 10s
79F = 1s
Time
Delays
0.1 to 600 seconds
0.001 second (0 to 0.999 seconds)
0.1 second (1.0 to 9.9 seconds)
1 second (10 to 600 seconds)
0.1 cycles (6 to 36000 cycles)
79M = 60s
Step List
1. 79SCB TRUE during Reset and while timing to Reset after
Lockout.
2. 79SCB TRUE when 79C is TRUE for first reclose and
while timing to Reset after first reclose.
3. 79SCB TRUE when 79C is TRUE for second reclose and
while timing to Reset after second reclose.
4. 79SCB TRUE when 79C is TRUE for third reclose and
while timing to Reset after third reclose.
5. 79SCB TRUE when 79C is TRUE for fourth reclose and
while timing to Reset after fourth reclose.
0
Reclosing Fail Timer (79F)
This timer begins when the 79C output becomes TRUE and continues counting until the STATUS input
becomes TRUE. If the 79F timer times out, the recloser function is driven to lockout and the 79LO output
becomes TRUE. The relay remains in Lockout until the breaker is manually closed and the STATUS input
remains TRUE for the reset time. This setting can be changed on the Reclosing screen in BESTCOMS.
See
Figure 4-57.
Maximum Cycle Timer (MAX Cycle)
Max Cycle is the reclose maximum operation time. If a reclose operation is not completed before the
maximum operate time expires, the recloser goes to Lockout. This timer limits the total fault clearing and
restoration sequence to a definable period. The timer starts when the first trip command is issued from a
protective element of the relay. The Max Cycle timer stops when the recloser is reset. If the total reclosing
time between Reset states exceeds the maximum reclose cycle timer setting, the recloser will go Lockout.
If the WAIT input goes high during the Max Cycle timing sequence, Max Cycle timing will “pause” until the
WAIT input goes low. If not desired, the Max Cycle timer can be disabled by setting it at zero. This setting
can be changed on the Reclosing screen in BESTCOMS. See
Figure 4-57.
Sequence Controlled Blocking (SCB)
The 79SCB output is TRUE when the breaker is closed, the 79 close output (79C) is TRUE, and the
reclose sequence step is enabled with a non-zero value in the S#-79SCB command. A 0 (zero) disables
the 79SCB output. This setting can be changed on the Reclosing screen in BESTCOMS. See
Figure
4-57.
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