This video of an oil transformer fire might be of interest and value.
It is part of a collection of "Big Arcs and Sparks" videos.
Apparently the oil filled transformers in the video have pressure
relief valves that activate from the increase in oil pressure caused
by the arc heat going on in the transformer failure. Eventually the
arcing ignites the cloud of released oil mist. Note that the
electrical power breakers are late in activating and the arcing does
not stop until they finally kick out. We always put a lot of faith
into those devices.
This link takes you to a site. From there select the "Big Arcs and
Sparks" link. Then select the "Arcing fault causes a 138 kV
substation power transformer to explode." link.
http://teslamania.delete.org/frames/frameindex.html
Allan Seidel
St. Louis , MO
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