Locke High-Tension Strain Insulator

HIGH-TENSION STRAIN INSULATORS.

Two forms of high-tension strain insulator are shown by Figs. 9 and 10 herewith. These are made by the Locke Insulator Manufacturing Company, of Victor, N. Y. The increase in the use of high-tension electric railways will naturally call for insulators capable of withstanding high mechanical as well as high electrical strains. The strain insulator shown by Fig. 9 is 6 ins. high and 5-3/4 ins. in diameter and has been designed for voltages as high as 8000. The company has also developed a smaller strain insulator for voltages of 5000 and under, which is useful in the construction of spans for trolley suspension. The company now has a complete line of strain insulators for voltages up to 35,000 and is developing a new design for voltages of 60,000 or more. With regard to the mechanical strength of the insulators, the company states that the larger designs can be relied on to withstand a breakdown test of approximately 12,000 lbs, with the insulator supported by a pin passing through the middle and the strain applied around the middle wire groove. In connection with these insulators the company has also developed a method of using them whereby almost any strain up to several tons may be applied with safety.

Fig. 9. - Strain Insulators. - Fig. 10.