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A three-phase symmetrical fault exists when all three line conductors are short-circuited, sometimes to earth (ground). An unsymmetrical fault occurs when only one or two of the three lines are involved.

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Why are symmetrical faults more severe than unsymmetrical faults?

Symmetrical faults involve all three phases and create higher fault currents, leading to faster operation of protective devices. Unsymmetrical faults only involve one or two phases and result in lower fault currents, which may not trip protective devices as quickly, causing more damage to the system.


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