17-Symmetrical Fault Analysis-28-Feb-2019Reference Material II_Need for Short Circuit Studies.doc

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F Transformer G Need for Short Circuit Studies The fault on the power system which gives rise to symmetrical fault current i.e., equal fault currents in the lines with 120 0 displacement is called a symmetrical fault The symmetrical fault occurs when all the three conductors of a three phase line are brought together simultaneously into short circuit as shown in figure. This type of fault gives rise to the symmetrical currents with 120 0 displacement. Fault currents I R , I Y , and I B wil be equal in magnitude with 120 0 displacement among them. Because of the unbalanced nature of fault, only one phase need be considered in calculations since the conditions in the other two phases will be similar. The following points may be particularly noted (i) The symmetrical fault rarely occurs in practice as majority of the faults are of the unsymmetrical in nature. However, symmetrical fault calculations are done to enable the power system problem (ii) The symmetrical fault is the most severe and imposes more heavy duty on the circuit breaker
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