I believe you are refering to GE using truck tire inner tubes for corona rings which I had heard of as well.
As far as flexible air duct I dont think the surface is smooth enough without testing the material. Unfortunately I have a customer that wants to purchase the corona rings assemblies...
I just wanted to leave an update. I had prices per ring coming as high as $3500 per ring plus $55,000 tooling. If anyone else ends looking for large corona rings or well any these company I found may be a good place to start. This company was one of the very few that could even make the rings...
See IEEE693-2005 is the latest IEEE Recommended Practice for
Seismic Design of Substations, a new version should be out in the next year or two that is much improved. Currently a web site is going up to update people on the progress of the standard. It can be found here...
Anyone know a company capable of making large corona rings. We are looking for 8"ODx.25wall tubing made into 44"OD rings. We are looking to purchase 18 of these and I cant find anyone willing to make them for us. Any help appreciated.
GE type U were manufactured between 1954 to 1986 during that time GE accounted for 65-70% of the bushings manufactured for the US market.
The most well known problem with these bushings is the Rescon ink that was used as the capacitive layers to form the core. There are many problem with this...
