Guys, Having had the chance to sit down and have a good look at the offered material, this is a site worthy of being linked through here. Even the Transformer basics are very easy to understand. Wish I'd had something like this during my training as a Line Mechanic.
#54378 - 08/02/0505:49 AMRe: New web site for electrical power
I had never heard of using a gas detector to detect faults on transformer. He must be using it to detect long-term events, such as arcing inside the tap changer of the transformer transformer. I would think a high speed differential relay would be a better choice to protect a transformer from internal fault current events. I used to run the oil analysis program for about 100 transformers in a pulp and paper mill. One thing we always took action on was a transformer that was wet, ie had a hydrogen present in that 200 ppm range. I saw several units that failed above that range. Good info, I want to look it over some more when I have time.
#54379 - 08/02/0509:11 AMRe: New web site for electrical power