RECLOSER CONTROL EVRC2A-N6,NT
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5-Reclosers Loop control at F1 Fault
Figure 6-8. 5-Reclosers Loop Control at F1 Fault
Step1 : When Permanent Fault occurs at F1, CB1 operates reclosing sequence and then Trip
Lockouts. During CB1 operation, accumulates Dead line time and the accumulated time
becomes “DL Pick T”. When a line is Dead Line, “LL Regain T” operates.
“DL Pick T” is set by summing all reclosing time of back line equipment.
SEC, MID, TIE has the same setting time.
Step2 : “LL Regain T” is set, and if the line is not becoming Live line within a set time,
SEC(RC1), MID(RC2), TIE(RC3) operate.
To operate “LL Regain T” from SEC
→
MID
→
TIE in turn, MID shall have longer time set
than SEC, TIE shall have longer time set than MID. When “LL Regain T” is enable,
SEC(RC1) is opened automatically, MID(RC2) changes to Alternate setting.
Step3 : When “LL Regain T” is finished, TIE(RC3) changes to Alternate setting automatically,
and then automatically close. F1 is isolated by Loop control operation, the rest of region
shall be alive by backward distributing line.
Step4 : After removing a Fault, close CB1, then, SEC(RC1) automatically close after Auto-
Restoration Time.
Step5 : Manually open TIE(RC3), change MID(RC2), TIE(RC3) setting to Primary setting.
Enable Loop control of TIE(RC3) to recover the line as previous normal line.
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