Date Code 20001006 Close and Reclose Logic 6-27
SEL-351 Instruction Manual
Additional Settings Example 3
Refer to Figure 6.4 and accompanying setting example, showing an application for setting 79STL.
Other Settings Considerations
If no special skip shot or stall open interval timing conditions are desired, make the following
settings:
79SKP = 0 (numeral 0)
79STL = 0 (numeral 0)
Block Reset Timing Setting (79BRS)
The block reset timing setting 79BRS keeps the reset timer from timing. Depending on the
reclosing relay state, the reset timer can be loaded with either reset time:
79RSD (Reset Time from Reclose Cycle)
or
79RSLD (Reset Time from Lockout)
Depending on how setting 79BRS is set, none, one, or both of these reset times can be controlled.
If the reset timer is timing and then 79BRS asserts to:
79BRS = logical 1
reset timing is stopped and does not begin timing again until 79BRS deasserts to:
79BRS = logical 0
When reset timing starts again, the reset timer is fully loaded. Thus, successful reset timing has to
be continuous. Use the RSTMN Relay Word bit to monitor reset timing (see Monitoring Open
Interval and Reset Timing earlier in this subsection).
Factory Settings Example
The block reset function is not enabled in the factory settings:
79BRS = 0 (numeral 0)
Additional Settings Example 1
The block reset timing setting is:
79BRS = (51P + 51G) * 79CY
Relay Word bit 79CY corresponds to the Reclose Cycle State. The reclosing relay is in one of the
three reclosing relay states at any one time (see Figure 6.5 and Table 6.1).
Courtesy of NationalSwitchgear.com
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