Schweitzer Engineering Laboratories SEL-351 - Section 6: Close and Reclose Logic

Date Code 20001006 Close and Reclose Logic i
SEL-351 Instruction Manual
TABLE OF CONTENTS
SECTION 6: CLOSE AND RECLOSE LOGIC.......................................... 6-1
Close Logic..............................................................................................................................6-1
Set Close ..........................................................................................................................6-2
Unlatch Close ...................................................................................................................6-3
Factory Settings Example..................................................................................................6-3
Set Close...................................................................................................................6-4
Unlatch Close............................................................................................................6-4
Defeat the Close Logic......................................................................................................6-4
Circuit Breaker Status.......................................................................................................6-4
Program an Output Contact for Closing.............................................................................6-5
Reclose Supervision Logic........................................................................................................6-5
Settings and General Operation .........................................................................................6-8
For Most Applications (Top of Figure 6.2).................................................................6-8
For A Few, Unique Applications (Bottom of Figure 6.2 and Figure 6.3) .....................6-8
Set Reclose Supervision Logic (Bottom of Figure 6.2) ........................................6-9
Unlatch Reclose Supervision Logic (Bottom of Figure 6.2) .................................6-9
Factory Settings Example................................................................................................6-10
Additional Settings Example 1.........................................................................................6-10
SEL-351(1) Relay ...................................................................................................6-11
SEL-351(2) Relay ...................................................................................................6-11
Other Setting Considerations for SEL-351(1) and SEL-351(2) Relays......................6-11
Additional Settings Example 2.........................................................................................6-12
Reclosing Relay......................................................................................................................6-12
Reclosing Relay States and General Operation.................................................................6-13
Lockout State..........................................................................................................6-14
Reclosing Relay States and Settings/Setting Group Changes ............................................6-15
Defeat the Reclosing Relay..............................................................................................6-15
Close Logic Can Still Operate When the Reclosing Relay is Defeated.......................6-16
Reclosing Relay Timer Settings.......................................................................................6-16
Open Interval Timers...............................................................................................6-16
Determination of Number of Reclosures (Last Shot).................................................6-17
Observe Shot Counter Operation..............................................................................6-18
Reset Timer.............................................................................................................6-18
Monitoring Open Interval and Reset Timing.............................................................6-19
Reclosing Relay Shot Counter.........................................................................................6-19
Reclosing Relay SELOGIC
®
Control Equation Settings Overview .....................................6-20
Reclose Initiate and Reclose Initiate Supervision Settings (79RI and 79RIS,
Respectively)...........................................................................................................6-20
Factory Settings Example ........................................................................................6-20
Additional Settings Example....................................................................................6-21
Other Settings Considerations..................................................................................6-22
Drive-to-Lockout and Drive-to-Last Shot Settings (79DTL and 79DLS, Respectively).....6-22
Factory Settings Example ........................................................................................6-23
Additional Settings Example 1.................................................................................6-24
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