Re: What are these power pole transformers for?

Steve B. wrote:
What are these things for? What do they do?



Here's an answer from our family electrical inspector...

Steve B.


"Oil circuit breakers and/or re-closures…

95% of things in series (on power lines) are some type of switch.
Often you will see they also have a fuse in parallel to them (but
open)..the fuse is in series with the power line also.. the fuse is
there, to be manually closed, in the event the C/B goes bad or needs
servicing.

Because of the voltage, if the breaker needed to open, especially
under "fault" (short) the amperage it needs to break might be
thousands of amps, therefore , the operation is all contained in a
canister filled with non-conductive oil. The contacts opening in oil,
without air, prevents flash & damage to the C/B.

They could be re-closures or a combo beaker/re-closure. Re-closures
are critters that, as their name says, reclose the line. They are set
for a certain amount of times (usually 3) so if something happens like
a squirrel gets on the transformer, the squirrel shorts, the breakers
opens, light go out.. the "blast" at the transformer ends with the
squirrel flying, clearing the "fault". The re-closure, in a preset
time, closes the line back minimizing the outage.

That makes more sense than a transformer to compensate for voltage drop; one would think that that would require a ground/neutral connection.

nate

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