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Power flashes are almost universally referred to as 'exploding transformers'. However, 'exploding transformer' is an incorrect term, as transformers are rarely the source of these arcs. A 'power flash' is simply an arc caused by a shorted-out power line. These short-circuits can occur anywhere on the power grid where live wires are allowed to contact each other, grounded objects or the earth itself. While power flashes sometimes do occur at an actual transformer, they are typically not associated with one.
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