Damage from a short circuit is a constant threat to any electric power system. Insulation damaged by aging an accident or lightning strike can unloose immense fault currents practically the only limit on their size being the impedance of the system between their location and power sources. At their worst, faults can exceed the largest current expected under normal load - the nominal current by a factor of 100 producing mechanical and thermal stresses in proportion to the square of the current's value.
Wednesday, July 1, 2009
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