[quote="Nasadowsk"]Cooper now sells a coolant that's soybean oil with BHT in it (yes, the same BHT in Corn Flakes). Highest flash point of any oil out there, it sucks moisture out of the paper. They've had it for a few years.
Hello:
While we are on the subject of dry oil, I guess I should explain the process of trainsformer filling.
Usually, a large transformer is shipped with dry nitrogen gas but when somebody finally gets to go inside the gas is purged with dry air.
After all the work is done inside, inspections, bushing instalation, conservator, and pumps etc. The main tank is placed under a near perfect vacuum. Water, (moisture) evaporates at very low temperatures under a vacuum so most if not all of the moisture will be removed after 24 hrs.
of "pulling" the vacuum.
Enter the oil tankers full of dry oil.
The oil is then pumped through a truck that has a boiler that the oil runs through to heat it up. Then the oil splashes through a vacuume chamber that removes any trace of moisture.
At this point the oil can be filtered through fullers earth to remove any impurities and then it is pumped into the transformer under vacuum.
This is a complicated process, but it is well worth it as the transformer (after testing) can be placed in service for years without problems.
If anybody needs more info I can elaborate!
Thanks for reading !
Jerry
For an interesting look at the construction of the Hoosac Tunnel, please see.....
"Hoosac Tunnel Then and Now"
www.jkrails.net