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Suspension and strain type insulators

 Suspension and Strain type insulators are both main kind of insulator used the transmission lines with the voltage up to 1000kV; when used in the vertical position (with the conductor hanging below) they are called "suspension type insulator"; when used in the horizontal, to dead-end a conductor, they are called "strain type insulator

strain type insulator              Suspension type insulator  

             strain type insulator                                        Suspension type insulator

Suspension and strain insulator can be used in string, also called suspension insulator or strain insulator string. The mechanical strength of a string is determined by the rating of the metal parts of a single unit, but the electrical rating can be increased by simply adding more units. This system allows for much higher insulation value than any pin-type insulator

For example, the largest one-piece pin-type power insulator ever made in the U.S. was the Corning Pyrex No. 701, which is rated at only 70,000 volts, while a string a suspension insulators could be assembled that stands off 1,000,000 volts or more.".

Suspension and strain type insulator can be divided into normal suspension insulator can anti-pollution suspension insulator in accordance of environment.

Suspension and strain type insulator can be made of polymer, such as ngk polymer suspension insulator and Orient Power composite suspension insulator.

 

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