Section 5 1MAC309294-MB F
Control functions
350 RER620
Technical Manual
service, as does S2 to recloser T. Figure 188 and Table 317 summarize the sequence of
events.
Figure 188: 5-Reclosre Fault 3 scenario Sequence of Events
Table 317: 5-Reclosre Fault 3 scenario Sequence of Events
5.4.5.3 Four-Recloser System Operation
A four-recloser system is a hybrid of the three- and five-recloser systems. Between one
source and the TiePoint, recloser is a Sectionalizing recloser and a Midpoint recloser. Only
a Sectionalizing recloser appears between the other source and the TiePoint. The
Sectionalizer and Midpoint from one source of the TiePoint is configured like reclosers in
a five-recloser system. The other Sectionalizing recloser is configured like its counterpart
in a three-recloser system. TiePoint configuration and operation is similar in all three
topologies.
5.4.5.4 Restoring Normal Operation
The "Reset Logic" section covered previously explains on the steps involved in resetting
the LCM function and activated again safely when reclosers working in different modes.
All the restoration steps should be performed before in full compliance with all applicable
safety procedures before resetting the LCM functionality in RER620 relay.
Time Event or Conditon
t0 Permanent line fault occurs. Midpoint recloser trips and locks out causing loss of voltage at
the TiePoint reclosers.
t1 TiePoint recloser declares phases dead, initiates loop control sequence, and closes its
breaker. May request ALT thresholds (per settings) before closing breaker.
t2 TiePoint breaker trips and locks out.
F
ault Initiates
Recloser T senses fault
current then lockout
Recloser T
changes to ALT1
setting and closes
t0 + 10s
2t0t t1
45 s - 3rd reclose and lockout
15 s - 2nd reclose
0.5 s - 1st reclose
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