Question

Which one of the following is symmetrical fault?
A) Line to Line to Line fault
B) Double Line to Ground fault
C) Single Line to Ground fault
D) Line to Line fault
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Answer 1

line to line fault

because symmetrical faults result in balanced conditions they maybe analyzed using per-phase analysis

Answer 2

The Line to Line to Line fault is the symmetrical fault. (Option A)

• In a symmetrical fault, all the phases are balanced and have an equal magnitude. Each of these phases is displaced by an equal angle of 120°.
• All these phases are shorted to each of them or the ground. It can be called Line to Line to Line or Line to Line to Line to ground.
• In this, the three lines or conductors are in contact with a neutral conductor (ground).