1-40
Factory-Set Logic
Date Code 990215
SEL-351P Manual Técnico
0
1
2
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)
2
3
2
1
4
3
4
3
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).
Содержание SEL-351P
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