David Dahle

David Dahle

Posted on 01/23/2014

Photo taken on January 22, 2014

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The Powerline Graveyard The Powerline Graveyard


SOS 13.8kV

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Northern States Power - Sioux Falls, SD

Northern States Power - Sioux Falls, SD
(swiped from Google Maps street view)

One of the singlephase poles on the South Sioux 4160V system while it was still pure 2400V. It's not often one sees a big 100kVA can on residential service, but that one can powers the entire block to the north!

A new 100kVA DV can sits on the pole, but it doesn't have ANY fins on it at all - guessing it will run a lot cooler once it's switched to 7970V mode.

Tony Glen, Qwerty Cody have particularly liked this photo

Justin S
Justin S
I've seen 100 kVA transformers with and without fins, it seemed to me that the ones without fins had a much bigger can? More oil for cooling I would think. You're right, I don't think I've ever seen that big of a transformer serving residential loads, 50 is about as big as I see. Depending on the proximity of that and the service drop size, you would think that the fault current could exceed what a residential main breaker could handle. I'd have to look up how to do the calculation.
4 years ago.