[RFI] A `Time Bomb' Sits Atop Utility Poles

[kd4e]

David Robbins wrote:
> They do on insulators.  Where I used to work we tested insulators in
> accelerated aging environments, breakdown voltage, and mechanical stress.
> Most insulators are supposed to have an expansion material, usually like a
> heavy tar, between the metal pin and porcelain.  In some cases the assembly
> is defective and the metal is in direct contact with the porcelain which can
> contribute to failures.  In other cases an air gap between the pin and
> filler allows corona and discharge internal to the insulator which is also
> bad.  Non-ceramic insulators have other types of problems and are easily
> damaged by rough handling or incorrect installation.


So it is just Chance who may have taken a short-cut in
design and manufacturing and left out the expansion
material?


-- 

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Thanks! & 73, doc kd4e

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