Schweitzer Engineering SEL-351P - Reclose Supervision Logic

1-40 Factory-Set Logic Date Code 990215
SEL-351P Manual Técnico
012
Fast curve - phase [51P1T; SEL-351P (1)] is disabled
Shot
Counter
79SEQ
51P1
Phase fault
beyond
SEL-351P(2)
SHO
SH1
OCP
51P1TC
Response of
SEL-351P(1)
2321 43 43
1
Fault occurs beyond SEL-351P(2)
2
Fault cleared by SEL-351P(2) Fast curve - phase
3
SEL-351P(2) recloses into fault
4
Fault cleared by SEL-351P(2) Delay curve - phase
DWG: M351P035
Figure SECTION 1: .29: Operation of SEL-351P(1) Sequence Coordination Logic for
Phase Fault Beyond Downstream SEL-351P(2)
R ECLOSE S UPERVISION L OGIC
See Figure SECTION 1: .30. After a reclose interval times out, a final check is made of the
reclose supervision logic before the SEL-351P auto-recloses the recloser. For auto-reclosing to
proceed, all
the following conditions must be met:
• Trip and reclose capacitors charged
• Healthy battery
After a reclose interval times out, the logic in
Figure SECTION 1: .30 is final checked for a time
period equivalent to EZ setting Close power wait time (corresponding setting 79CLSD – see
Figure 6.2). If SEL
OGIC setting 79CLS (reclose supervision) asserts to logical 1 any time during
this time period, auto-reclosing proceeds.
Note that the reclose supervision logic in
Figure SECTION 1: .30 uses some of the same logic
that drives the BATERIA PROBLEMA LED (see
Figure SECTION 1: .45).