1MAC309294-MB F Section 5
Control functions
RER620 345
Technical Manual
Figure 183: 3-Recloser Fault 1 Sequence of Events
Table 313: 3-Recloser Fault 1 Sequence of Events
3-Recloser Fault 2 Scenario
If a permanent fault occurred at location F2, Figure 182, the following sequence occurs;
recloser
B proceeds through its reclosing sequence of overcurrent protection, which is the primary
protection activity for the RER620. Upon tripping of recloser B, recloser T senses loss of
voltage and after its time delay of t1 seconds, closes onto the permanent fault. Since this
fault is permanent and recloser T has closed into the fault, recloser T goes directly to
lockout by design. The unfaulted portion of the distribution feeder circuit between S1 to
recloser B remains in service, as does S2 to recloser T. Figure 184 and Figure 314
summarize the sequence of events.
Time Event or Conditon
t0 Permanent line fault F1 occurs between source and Sectionalizing recloser. Source circuit
breaker trips and locks out causing loss of voltage at the Sectionalizing and TiePoint
reclosers.
t1 Sectionalizing recloser declares phases dead, initiates loop control sequence, trips and
locks out the breaker.
t2 TiePoint recloser declares phases dead, initiates loop control sequence, changes to
Alternate 1 settings and closes. Providing service up to the Load Side of Sectionalizer B.
S1
Permanent
Fault Initiates
Reclose
Sequence
Recloser B trips on
Loss of Voltage
Recloser T
changes to ALT1
setting and closes
(Typically t1 + 10s)
2t0tt1
45 s - 3rd reclose and lockout
15 s - 2nd reclose
0.5 s - 1st reclose
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