Lecture-1 Unsymmetrical Fault Analysis: Introduction

Unsymmetrical faults involve only one or two phases. In unsymmetrical faults the three-phase lines become unbalanced. Such types of faults occur between line-to-ground or between lines. An unsymmetrical series fault is between phases or between phase-to-ground, whereas an unsymmetrical shunt fault is unbalanced in the line impedances. Shunt fault in the three-phase system can be classified as;

Single line-to-ground fault (LG).
Line-to-line fault (LL).
Double Line-to-ground fault (LLG).
Three-phase short circuit fault (LLL).
Three-phase-to-ground fault (LLLG).

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