File:EXTERIOR VIEW SHOWING THE OILOSTATIC TERMINALS IN THE GENERATING PLANT SWITCH YARD. - Wilson Dam and Hydroelectric Plant, Oilostatic Transmission System, Spanning Tennessee HAER ALA,17-MUSHO,2B-2.tif

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EXTERIOR VIEW SHOWING THE OILOSTATIC TERMINALS IN THE GENERATING PLANT SWITCH YARD. - Wilson Dam and Hydroelectric Plant, Oilostatic Transmission System, Spanning Tennessee River at Wilson Dam Road (Route 133), Muscle Shoals, Colbert County, AL
Photographer

Lowe, Jet

Related names:

Tennessee Valley Authority
Benz, Sue, transmitter
Title
EXTERIOR VIEW SHOWING THE OILOSTATIC TERMINALS IN THE GENERATING PLANT SWITCH YARD. - Wilson Dam and Hydroelectric Plant, Oilostatic Transmission System, Spanning Tennessee River at Wilson Dam Road (Route 133), Muscle Shoals, Colbert County, AL
Depicted place Alabama; Colbert County; Muscle Shoals
Date 1994
date QS:P571,+1994-00-00T00:00:00Z/9
Dimensions 5 x 7 in.
Current location
Library of Congress Prints and Photographs Division Washington, D.C. 20540 USA http://hdl.loc.gov/loc.pnp/pp.print
Accession number
HAER ALA,17-MUSHO,2B-2
Credit line
This file comes from the Historic American Buildings Survey (HABS), Historic American Engineering Record (HAER) or Historic American Landscapes Survey (HALS). These are programs of the National Park Service established for the purpose of documenting historic places. Records consist of measured drawings, archival photographs, and written reports.

This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing.

Notes
  • Significance: As generating capacity at Wilson Dam grew through the early TVA years, new methods of generator cable installation came into practice. One of these new cable installations, the Oilostatic System, was introduced to Wilson Dam in 1943. Using oil-filled pipe pressurized to 200 pounds per square inch, two generator main connections of approximately 1,435 and 1,780 feet in length were installed in conjunction with generator units 15 and 16 of the dam's 19-unit-capacity powerhouse. In 1947, units 13, 14, 17 and 18 were installed with the new system. At the time of Wilson's first cable installation in 1925, common practice was to wrap generator leads in impregnated paper and then cover them with a lead sheath. Wilson's first leads were simply wrapped in braided cotton. However, when increased loadings were found to be limited by high dielectric losses in the cable, and when subsequent insulating materials developed problems with ionization, the Okonite-Callender Cable Copmpany developed its Oilostatic Transmission System, unveiling its first commercial design in 1932. In addition to handling increased loadings, the Oilostatic system was installed at Wilson in order to fit the limited space available, to conserve copper, and to provide good protection against mechanical injury. The oilostatic system included a twin pumping plant for pressurizing the oil within the cable while maintaining the oil under a vacuum to prevent oxidation. Specially designed terminating joints and bushings would keep cable connections within pressurized oil, allowing the transfer of current to substations and switchyards.
  • Unprocessed Field note material exists for this structure: N166
  • Survey number: HAER AL-47-B
References

This is an image of a place or building that is listed on the National Register of Historic Places in the United States of America. Its reference number is 66000147.
Source https://www.loc.gov/pictures/item/al1188.photos.046700p
Permission
(Reusing this file)
Public domain This image or media file contains material based on a work of a National Park Service employee, created as part of that person's official duties. As a work of the U.S. federal government, such work is in the public domain in the United States. See the NPS website and NPS copyright policy for more information.
Object location34° 44′ 40.99″ N, 87° 40′ 03″ W Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo

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