David Dahle

David Dahle

Posted on 05/26/2013


Photo taken on May 24, 2013


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The Powerline Graveyard The Powerline Graveyard



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4160V
7200V delta


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Montana-Dakota Utilities - Dodge, ND

Montana-Dakota Utilities - Dodge, ND
Well, there it is. Possibly the VERY last surviving Hughes Electric / North Dakota Power & Light Co. sub still in service.

This was originally a 13.2kV/2400V sub but when I took this picture, it was running at 7200V delta in, 4160V wye out.

Lewis Perkins, Power Scale Modeler, Power Lines, Jesse Lor and 3 other people have particularly liked this photo


7 comments - The latest ones
Power Lines
Power Lines
That's a nice little sub there! Looks like lots of old mud on the high-voltage arms on top. I also like the large-size flat steel braces they used.

That line could still be 13.2kV--the transformers in the sub have large-size bushings, but they are hooked up in delta too. They could pass for 13200v units. I know the transformers I've also seen on CL&P's delta-connected 27.6kV system have larger bushings than these.

Do you have any other shots of the higher-voltage line where the voltage is in question?
4 years ago.
David Dahle has replied to Power Lines
I finally determined what voltage the high side is - 7200V delta. The 7200V starts out of the sub just south of nearby Halliday and which also serves Werner (Halliday's system is 4160V, however). This is the same distribution circuit with the one pole that has those "classic white" insulators.
3 years ago.
David Dahle
David Dahle
MDU moved Dodge off the Halliday sub and onto the 41.6kV system!!!
3 years ago.
Power Lines
Power Lines
Is this sub gone?
3 years ago.
David Dahle has replied to Power Lines
Nope. MDU built a 41.6kV/4160V sub right in front of it. The old sub now serves the rural 7200V delta line (itself the original 13.2kV transmission line).

www.ipernity.com/doc/ndlinegeek/34733989
3 years ago. Edited 3 years ago.
Power Lines has replied to David Dahle
How about that. So I guess this sub's still up and playing an important role after all! It's always neat when a utility adds more cool stuff to existing cool stuff. : )

So now I wonder....what's the story with that 7200? Has it been moved from one sub to another?
3 years ago.
David Dahle has replied to Power Lines
For some reason they took out a segment of the 7200 between Halliday and Dodge. Could be that MDU needed to unload the Halliday sub a bit as it's on the edge of the oil patch while Dodge is on the edge of coal country.

As for the 7200 line, this sub is now the source for the 7200V line serving the Halliday and Golden Valley rural customers.
3 years ago. Edited 21 months ago.