Rev.04
40/112
4.13 Function 79. AC Reclosing device
The reclosing function tries to reconnect the circuit breaker after a fault. It has four reclosing attempts
capacity. After them, if the circuit breaker has not reclosed correctly, it goes to ‘Lockout’ state.
The reclose can be disable if it is not required, by setting the
Number of Recloses
to 0.
Disable must not be confused with blocked. Disable means that the recloser shall never be in operation,
regardless of the controls performed on it. A blocked recloser means that the recloser is not operative,
but either because it has reached the end of the reclosing cycle, or an irregularity has been detected, or
someone has performed a control procedure on it reaching the Lockout state.
Each reclosing cycle has its own specific operation time (
Reclose Time #
) that can be set independently.
Also, up to four different signals with a logic condition can be assigned to the start condition (logic signal
-
79N# Start
) of each cycle. The cycles are always done sequentially, that is, if the function is going to
start the first reclose cycle, but the reclose condition for the first cycle is not achieved and the condition
for the second cycle is, then the function will not start.
If in
Hold Enable
Yes is selected, once the cycle is initiated, another permission (logic signal -
79Enable
)
can be used to indicate that the recloser must wait another period of time
(Hold time
) before closure.
During this waiting time, usually an external condition wired to an external input, such as closure
synchronism, give the authorization to reconnect. If in
Hold Enable
No time is selected, there will no
limitation in terms of time, the only way to reconnect is through the logic signal 79Enable.
Apart from these times, two additional times must be set on this function:
✓
Reset time
: This is the waiting time for the recloser for a final closure. If during this time, there
is another trip, the recloser count will increase.
✓
Safe time
: Is the security time used by the recloser. When it comes from a lockout mode
consequence of an unexpected condition of a reclose cycle and the circuit breaker is closed this
waiting time must be observed. On exceeding this time without a circuit breaker opening, the
recloser switches to Standby mode.
Function
Description
Minimum
Maximum
Step
Unit
Default
79 (*)
AC Reclosing Device
Reclose Number
0
4
1
-
0
Reset Time
0.020
2000.000
0.001
s
5.000
Reclose 1 time
0.020
2000.000
0.001
s
0.250
Reclose 2 time
0.020
2000.000
0.001
s
2.00
Reclose 3 time
0.020
2000.000
0.001
s
2.000
Reclose 4 time
0.020
2000.000
0.001
s
20.000
Hold Enable
-
-
No/Yes/No time
-
No
Hold time
0.000
2000.000
0.001
s
0.200
Safe time
0.020
2000.000
0.001
s
30.000
(*) Optional depending on model
It must be possible to block the recloser, specially is maintenance tasks are carried out on the substation.
To achieve this, there is two logical signals
79Block Command
and
79Unblock Command
where up
to 4 logical inputs can assigned to each one. By default, they are configured as follows:
Содержание SIL-A A Series
Страница 8: ...www fanox com Rev 04 8 112 2 1 2 Case dimensions The dimensions are in mm...
Страница 9: ...www fanox com Rev 04 9 112 2 1 3 Connection diagrams 2 1 3 1 Analog connections...
Страница 12: ...www fanox com Rev 04 12 112 2 2 SILA with short circuitable current terminals 2 2 1 Front view...
Страница 13: ...www fanox com Rev 04 13 112 2 2 2 Case dimensions The dimensions are in mm...
Страница 14: ...www fanox com Rev 04 14 112 2 2 3 Connection diagrams 2 2 3 1 Analogic connections...
Страница 22: ...www fanox com Rev 04 22 112 3 3 Functional diagram...
Страница 34: ...www fanox com Rev 04 34 112 4 10 4 Thermal protection curves This is the thermal curve for 3 minutes...
Страница 61: ...www fanox com Rev 04 61 112...
Страница 63: ...www fanox com Rev 04 63 112...
Страница 64: ...www fanox com Rev 04 64 112...
Страница 65: ...www fanox com Rev 04 65 112...
Страница 111: ...www fanox com Rev 04 111 112 11 APPENDIX NOTES...
