Description:
A ground fault on a capacitor bank on the low voltage (LV) side of this electrical substation creates an arcing fault that behaves like an uncontrollable welding torch from Hell, chewing up everything in its path. Unfortunately, protection hardware fails to open the high voltage (HV) side or is unable to sense the presence of the fault. Excessive current eventually causes the windings on the substation's power transformer to overheat, severely cooking its innards and bringing the mineral oil inside to the boiling point. In a vain attempt to prevent the transformer's tank from exploding, pressure release valves or a failing tank gasket vents clouds of superheated oil vapor. The foggy mist of hot oil is then ignited by the LV arc, causing it to explode in a ball of flame.
Rating:[GA] General Audiences
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