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Hubbell horizontal line post insulators

Development for line post insulators/Hubbell horizontal line post insulators:
Traditionally, transmission insulators were suspended from tower arms. Because both insulators and tower arms serve as mechanical supports, a natural progression was to use insulators to replace structure arms. Initial efforts toward this end involved using line post insulators.

Hubbell horizontal line post insulators

The utilization of line posts as insulating structure arms reduces the overall size of support towers. Additionally, by eliminating the traditional l-string, the design is able to more tightly fix the position of the conductors in space, thus reducing the required right-of-way width and assuring appropriate climbing clearances.

Hubbell horizontal line post insulators early designs were manufactured with porcelain and were used for voltages 69kv and below. The designs were gradually expanded to accommodate higher voltages by increasing the length of the insulator. As the section lengths increased, the line posts were required to support higher moments.

Main factors when design line post insulators:
Tension loading of the brace insulator string
Compression loading of the line post insulator
Magnitude of the load applied to the line end fitting
Total moment applied to the line post insulator

Now Hubbell horizontal line post insulators design consider all above them, and make the line post insulators have good performance and high quality.

 

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