Power Lines

Power Lines

Posted on 08/14/2013


Photo taken on August 13, 2013


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12470V
2400V


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Union-Pacific Railroad 2.4kV - Caldwell, ID

Union-Pacific Railroad 2.4kV - Caldwell, ID
The railroad line fades off into the distance here. In the background is a 7.2/12.47kV distribution line from Idaho Power. Note the very long ridge pins on the railroad power line. The middle phase is grounded out and used as a shield wire, with the line running at either 2.4kV or 4.8kV ungrounded single phase.

Johnvosh, Qwerty Cody, Hungry4Power, Jesse Lor and 3 other people have particularly liked this photo


Comments
Chetlaham
Chetlaham
Are the bottom circuits still in use?
4 years ago.
Matt Weldon has replied to Chetlaham
The bottom crossarm without the wires were more than likely remnant telephone circuits because of the many transposition brackets down the other poles. The next two crossarms would be circuits for signaling and possibly power. The top crossarm for power circuits.
4 years ago.
Chetlaham has replied to Matt Weldon
Thanks! Never thought of it for phone use but it makes sense now.
4 years ago.
David Dahle
David Dahle
In about the middle you see the two poles without ridge pins and the 2400V wires set in from the edge - that is the normal arrangement. Whenever the line approached a transformer location, the 2400V lines move to the edges of the crossarm and the shield pin and its wire then appear. There must have been multiple transformers for there to be so many poles with shield wire.

The first time I saw the UPRR was down in Omaha and the line down there had multiple segments where the shield wire sections covered only 4 spans at a time (3 shield-wire poles with the transformer on the middle one, and the other two had arresters on the 2400V wire and the shield wire was grounded).
13 months ago.