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I am a mechanical engineer and interested to learn about electical issues and in particular High voltage testing.
When our new high voltage 11KV switch gear was tested they told me they first tested to 28KV at their factory and when installed it can not be tested to the same volatege as the first test would have stressed the switch gear. It can only be tested to 22Kv 80% of the first test and any further tests will be reduced to 80% of previous tests.
What is this stress, is it because when the Cu busbrs are subjected to 28KV the charge it is subjected to impose such a electical field on the insulators so the covelant bonds in the insualtaion mateiral minily polimers get damaged of the conductor material Cu when subjectd to excessive electircal field with no current passing enegrise the electorsn and attoms so they reposition themsleves and get stressd and get brittle.
Thank you
Stepen
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