Notes on General Electric Alternating-Current Machinery - VI

Comments about GE insulators

[Trade Journal]

Publication: Electrical World

New York, NY, United States
vol. XXVII, no. 20, p. 549-550, col. 1-2

Insulators. - With the installation of high-potential plants it has been necessary to improve upon the insulators employed upon the lines carrying high voltages, and after a great deal of experimenting the General Electric Company has now adopted a double-petticoat porcelain insulator for voltages up to 15,000 or 20,000. Before these insulators leave the factory they are subjected to a very careful test at 30,000 volts. It is found that not 1 per cent. of the insulators crack at this potential, but practically all of them stand at least 40,000, even when supported on wet wooden pins and covered with snow or moisture. Since it might be of interest to know how these tests are carried out, we will briefly mention the methods employed.

These high-potential insulators have been used in several places, for instance, Folsom, Cal.; Guadalajara, Mex.; Regla, Mex., and the circuits upon which they are employed are from 10,000 to 12,000 volts.

Keywords:	General Electric Company : U-744
Researcher notes:	The General Electric referenced is U-744.
Supplemental information:	Article: 5180
Researcher:	Elton Gish
Date completed:	June 3, 2005 by: Elton Gish;