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above tripping occurs. At this time, dead time counter TD3 is started. The third shot autoreclose is
performed after the period of time set on TD3 has elapsed. At this time, the outputs of the step
counter are: SP1 = 0, SP2 = 1, SP3 = 0, SP4 = 0 and SP5 = 0.
The three shot mode of autoreclose is then complete, and tripping following a "reclose-onto-a-fault"
becomes the final trip (ARC FT = 1).
When four or five shot autoreclose is selected, autoreclose is further retried once again for tripping
that occurs after "reclose-onto-a-fault". This functions in the same manner as the three shot
autoreclose.
If a fault occurs under the following conditions, a final trip is performed and autoreclose is blocked.
• Reclosing block signal is applied.
• During the reclaim time
• Auto-reclose conditions by PLC signals ARC-S*_COND have not been met.
In the OC∗, EF∗ and SE∗ protections, each tripping is selected by setting [OC∗-TP∗], [EF∗-TP∗]
or [SE∗-TP∗] to any one of "Inst"(instantaneous trip), "Set"(delayed trip by T∗∗∗ and [M∗∗∗]
setting) or "Off"(blocked).
TRDY
t
0
ARC READY
&
0.0-600.0s
[ARCEN]
+
"ON"
ARC INIT (Trip command)
≥1
EXT TRIP
Autoreclose initiation
ARC-SUCCESS
ARC FAIL
ARC-FT
Reset
TRSET
t
&
CB CLOSE
0.01-300.00s
TARCP
&
t
0
0.1-300.0s
TRCOV
0
t
1
0.1-600.0s
MANUAL CLOSE
S
&
&
F/F
SP1
R
ARC-SHOT1
ARC REQ
TP1
&
"ON"
[ARCREQ]
"OFF"
+
&
SP2
ARC-SHOT2
&
SP3
ARC-SHOT3
≥1
&
SP4
ARC-SHOT4
0
≥1
&
SP5
ARC-SHOT5
&
Figure 2.13.1 Autoreclose Scheme Logic
56
TD1
t
0
S
&
F/F
0.01-300.00s
R
ARC_R
≥1
TR1
t
0
ARC-FT
0.01-310.00s
TD2
t
0
S
&
F/F
0.01-300.00s
R
ARC_R
TR2
t
0
ARC-FT
0.01-310.00s
TD3
t
0
S
&
F/F
0.01-300.00s
R
ARC_R
TR3
t
0
ARC-FT
0.01-310.00s
TD4
t
0
S
&
F/F
0.01-300.00s
R
ARC_R
TR4
t
0
ARC-FT
0.01-310.00s
TD5
t
0
S
&
F/F
0.01-300.00s
R
ARC_R
TR5
t
0
ARC-FT
0.01-310.00s
6 F 2 T 0 1 7 2
STEP COUNTER
CLK
ARC-SHOT1
ARC-SHOT2
213
TW
≥1
ARC-SHOT3
ARC-SHOT
≥1
ARC-SHOT4
0.01-10.00s
ARC-SHOT5
SP1
SP2
SP3
SP4
SP5
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