General Electric Pogo Insulator

[Trade Journal]

Publication: The Signal Engineer

Chicago, IL, United States
vol. 3, no. 6, p. 263-264, col. 2, 1

INSULATOR FOR 4,400-VOLT LINE.

 

The porcelain insulator, shown in the diagram, was designed by E. O. Sessions, of the General Electric Company, for use on 6,600-volt alternating current transmission lines, and it is recommended for lines employing a potential of over 2,200 and not exceeding 6,600 volts. The insulator was built for conditions which obtain throughout the Rocky Mountains and Pacific Slope states; and it will be used by the Atchison, Topeka & Santa Fe in the transmission line for alternating current signals which will shortly be installed between Cottonwood and Daggett, Cal. This transmission will be three-phase, 25-cycle, 4,400-volt. The insulators are being produced by what is known as the "wet process." Moist clay is used, and the insulators are subject to great pressure in shaping and are afterward baked slowly. The process of manufacture requires six weeks. Before leaving the factory each insulator must stand a "wet" test of 18,000 volts.

 

Insulator for 4,400-Volt Line.
Insulator for 4,400-Volt Line.

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Keywords:Pogo : U-585
Researcher notes:The "pogo" type insulator was made by the R. Thomas and & Sons Co. The pogo insulator styles range from U-581 to U-596. The insulator in the illustration was Thomas No. 1086, which is style U-585. Thomas introduced pogo styles in 1907 and started showing the U-585 in their 1912 catalog along with additional styles. The pogo began to lose favor a few years later as evidenced by fewer styles shown in their 1917 catalog and only one basic style in their 1920 catalog.
Supplemental information: 
Researcher:Elton Gish
Date completed:December 4, 2019 by: Elton Gish;