Unsymmetrical Fault | Single line-to-ground fault (SLG) | Line-to-line fault (L-L) || PSA

-------------------- Credit : Dr.Muhammad Adil -----------------------
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Faults may be classified into four types. The different types of fault are listed here in the order of the frequency of their occurrence.

Single line-to-ground fault (SLG)
Line-to-line fault (L-L)
Double line-to-ground fault (2LG)
Balanced three-phase fault

Single Line-to-Ground Fault
A single line-to-ground (SLG) fault is the most commonly occurring unsymmetrical fault. It may be caused by a vehicular accident causing one of the phase conductors to fall and come in contact with the earth, or it may be caused by tree branches, or it could be caused by flashovers across dusty insulators during rain-shower.

Generally, a single line-to-ground fault on a transmission line occurs when one conductor drops to the ground or comes in contact with the neutral conductor. Such types of failures may occur in power system due to many reasons like high-speed wind, falling off a tree, lightning, etc.
Line-to-Line Fault
A line-to-line (L-L) fault involves a short circuit between two phase conductors that are assumed to be phases b and c. Therefore, there is symmetry with respect to the principal phase a

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