11 KV

[electrofelon]

Was working with POCO to energize a new service that was a block away from a substation. This was in Providence RI. That area had 2400/4160 distribution. He said the substation was served with 11KV. Hadnt heard of that voltage before. Anyone familiar with it? Seems around here practically all of the 15KV class is 12.47 or 13.62.

 

[wbdvt]

One utility I worked at had an 11kV line that went from an old hydro station to a sub where it was stepped up to 46kV. It was about 10 miles of line.

 

[Tony S]

11kV is a common European voltage and many manufacturers will rate their switchgear on that standard. Your local PoCo maybe using gear from this side of the pond.

Other than that I haven’t clue.

 

[drcampbell]

11kV is (was?) a common voltage for electric trains.
11kV was used for one of the first long-distance (22 miles) transmission lines, between Niagara Falls and Buffalo, New York, in 1893.

 

[broadgage]

As above, 11KV is very common in the UK.
There is some legacy 3.3KV and 6.6KV but 11KV is the norm for stepping down to utilisation voltage. A lot of power stations generate at 11KV before stepping up to 132KV, 275KV, or 400KV for transmission.

Not widely used for trains, 25KV is the norm in much of the world for new electrification.

 

[electrofelon]

Cool, thanks for the info.

 

[Jraef]

PG&E out here in the west uses 11kV for underground neighborhood distribution. I have an 11kV transformer in a vault on the corner of my property. I only know that it’s 11kV to 120/240 because when I ran my business out of my house 20 years ago, the MV cable under my sidewalk faulted and exploded, lifting a huge chunk of the sidewalk up. When they replaced it they tested the transformer too and decided to replace that as well. I was without power for a couple of days so I watched them swap it out and of course, asked a lot of annoying (to them) questions. They use 11kV because the sealed transformers they use come that way, likely European.