Schweitzer Engineering Laboratories SEL-351 - Page 222

ii Close and Reclose Logic Date Code 20001006
SEL-351 Instruction Manual
Additional Settings Example 2.................................................................................6-24
Other Settings Considerations..................................................................................6-24
Skip Shot and Stall Open Interval Timing Settings (79SKP and 79STL, Respectively).....6-24
Factory Settings Example ........................................................................................6-25
Additional Settings Example 1.................................................................................6-25
Additional Settings Example 2.................................................................................6-26
Additional Settings Example 3.................................................................................6-27
Other Settings Considerations..................................................................................6-27
Block Reset Timing Setting (79BRS)...............................................................................6-27
Factory Settings Example ........................................................................................6-27
Additional Settings Example 1.................................................................................6-27
Additional Settings Example 2.................................................................................6-28
Sequence Coordination Setting (79SEQ)..........................................................................6-28
Factory Settings Example ........................................................................................6-29
Additional Settings Example 1.................................................................................6-29
Additional Settings Example 2.................................................................................6-31
Reclose Supervision Setting (79CLS)..............................................................................6-32
TABLES
Table 6.1: Relay Word Bit and Front-Panel Correspondence to Reclosing Relay States ....................6-13
Table 6.2: Reclosing Relay Timer Settings and Setting Ranges.........................................................6-16
Table 6.3: Shot Counter Correspondence to Relay Word Bits and Open Interval Times ....................6-19
Table 6.4: Reclosing Relay SELOGIC Control Equation Settings ......................................................6-20
Table 6.5: Open Interval Time Factory Settings...............................................................................6-26
FIGURES
Figure 6.1: Close Logic ......................................................................................................................6-2
Figure 6.2: Reclose Supervision Logic (Following Open Interval Time-Out)........................................6-6
Figure 6.3: Reclose Supervision Limit Timer Operation (Refer to Bottom of Figure 6.2)......................6-7
Figure 6.4: SEL-351 Relays Installed at Both Ends of a Transmission Line in a High-Speed
Reclose Scheme........................................................................................................6-10
Figure 6.5: Reclosing Relay States and General Operation ................................................................6-13
Figure 6.6: Reclosing Sequence From Reset to Lockout With Factory Settings ..................................6-17
Figure 6.7: Reclose Blocking for Islanded Generator.........................................................................6-26
Figure 6.8: Sequence Coordination Between the SEL-351 Relay and a Line Recloser.........................6-29
Figure 6.9: Operation of SEL-351 Relay Shot Counter for Sequence Coordination With Line
Recloser (Additional Settings Example 1)..................................................................6-30
Figure 6.10: Operation of SEL-351 Relay Shot Counter for Sequence Coordination With Line
Recloser (Additional Settings Example 2)..................................................................6-32
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