The unsymmetrical network can be expressed in terms of three linear symmetrical components. Symmetrical components are derived to analyze unsymmetrical faults. This type of fault occurrence ranges from 15 to 25% of occurrence. Double line to ground fault occurs when two lines are short circuited and is in contact with the ground. This type of fault occurrence ranges from 5 to 15%. Double line fault occurs when two lines are short circuited. This fault will occur when any one line is in contact with the ground. Single line to ground fault is the most frequently occurring fault (60 to 75% of occurrence). Single line to ground faults (LG fault)ģ. In case of tree branches falling on lines, a short circuit of transmission lines will occur.ġ. The open circuit or short circuits of transmission or distribution lines will lead to unsymmetrical or symmetrical faults in the system. ![]() The natural disturbances are heavy wind speed, ice loading on the lines, lightening strokes and other natural disasters. It can occur either by natural disturbances or by manual errors. ![]() The unsymmetrical fault occurs in a system due to presence of an open circuit or short circuit of transmission or distribution line. Unsymmetrical faults are the faults which leads unequal currents with unequal phase shifts in a three phase system.
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