Auto Reclosing

Why circuit is breaking and how frequent, Should be a question. And its answer can be helpful in deciding.

It can be advisable to use these devices. It can also be a bad choice. It all depends on a lot of other things not presented.

If you have to ask, you probably should not.

I'd ask a local electrical expert, were I you.

You mean Transient fault (not intermittent fault).

In overhead line distribution, 80% of faults are transient nature and tripping and reclosing is the best way to restore the service fast. In case of Cable feeders, there are no transient fault. If insulation is damaged it cannot recover on its own, is damaged for good.

Agreed. In most cases if the fault occurs on a cable underground it is not intermittent so reclosing into a permanent fault is just a bad, bad idea.

45+ years back at engineering college one of our lecturers gave us a project as homework. It was to control a timed and monitoring sequence using opamps.

The circuit he had designed while working for a switchgear manufacturer in the early 60’s became our homework.

Fault.
Switch open.
Wait.
Switch close.
Switch open if fault is still there.
Wait.
Switch close.
Switch open if fault is still there.
Wait.
Switch close for a couple of seconds to try and burn the fault clear.
Switch open if fault is still there followed by Lockout.

No.