Transformer+Failure

media type="youtube" key="fzbQjd_Oo4Q" height="315" width="420" // This was a 138Kv transformer that faulted on the secondary side. The fault still had enough resistance so that the overcurrent protection on the primary side failed to open. As the fault continues to arc the transformer windings heat up more and more. Finally the mineral insulating oil is heated to its boiling point and iether the seals or pressure relief valve opens. When the mineral oil boils it one of the gases it releases is acetalene. The resultant fireball is quite devastating esulting in massive losses. As the oil bursts into flames teh primary side arcs out and the primary protection opens. // // As linemen often say, "Firemen don't mess with their wires, and linemen don't mess with their fires". A very sobering look at the explosive power lurking within that quietly humming substation in your neighborhood... //