Schweitzer Engineering SEL-351P, Quick Start Manual

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6-24 Close and Reclose Logic Date Code 990215
SEL-351P Manual Técnico
Figure SECTION 6: .7: Reclose Blocking for Islanded Generator
If the line is energized, channel VS overvoltage element 59S1 can be set to assert. Make the
following setting:
79STL = 59S1 + ...
If line voltage is present, Relay Word bit 59S1 asserts, stalling open interval timing (reclose
block). If line voltage is not present, Relay Word bit 59S1 deasserts, allowing open interval
timing to proceed (unless some other set condition stalls open interval timing).
Additional Settings Example 3
Refer to Figure SECTION 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