David Dahle

David Dahle

Posted on 07/12/2015


Photo taken on July 11, 2015


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23.9kV
7200V delta


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Photo replaced on July 12, 2015
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Northern States Power - Marion, SD (rural)

Northern States Power - Marion, SD (rural)
This ancient sub is still humming away!

SW Ohio Lines, Tony Glen, Justin S and 2 other people have particularly liked this photo


Comments
Power Lines
Power Lines
This is a great old sub. I see that there are two pellet arresters on the 7.2kV as well.

All three transformers look very old. That one on the left is pretty ancient as well since the 7.2kV bushings are facing down.
2 years ago.
Justin S
Justin S
Does this substation have a three letter code? I can see a yellow plaque but suppose it just says voltage.
2 years ago.
David Dahle has replied to Justin S
It just says "Rosefield / 23.9-7.2kV".
2 years ago.
Justin S
Justin S
That makes sense. I think that weird setup in Westport was the same. (69 kV to 7.2 kV)

I've come to believe that there had to be numerous substations built like this across the system. There are places near me where I think that there could have been something like this tapped off the 34.5 kV system, but have been long retired before I came along. This one and a few others you've shown tapped off 23.9 kV could be the last ones left.
2 years ago.
David Dahle has replied to Justin S
I'd have to agree with you on that - I'm thinking the one 23.9/4kV sub in Minot that I vaguely recall was likely of this design. There are only 4 left of this type of sub here in SD and this is the only 3-phase one. The others all put out 7200V singlephase, but one of those three subs has been significantly modified.
2 years ago. Edited 4 months ago.