ABB RER620 Technical Manual page 351

1MAC309294-MB F
RER620
Technical Manual
0.5 s - 1st reclose
15 s - 2nd reclose
45 s - 3rd reclose and lockout
0 t
S1 Recloser B trips on
Permanent
Loss of Voltage
Fault Initiates
Reclose
Sequence
Figure 183: 3-Recloser Fault 1 Sequence of Events
Table 313: 3-Recloser Fault 1 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.
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.
t1 2 t
Recloser T
changes to ALT1
setting and closes
(Typically t1 + 10s)
Section 5
Control functions
345