In this paper, voltage sags produced by balanced and unbalanced short circuits are analyzed by means of stochastic assessment methods, i.e., analytical and fault position method. These methods have been tested and compared through simulations on 5-bus standard test system. All the simulations were carried out using a code developed in MATLAB. Simulation results show that these methods give reliable and accurate information related to voltage sag magnitude. However, the analytical approach is straight forward and different fault distributions along the lines can be effortlessly considered. The main feature of this approach is that contrary to the fault positions method, it does not require a pre-assignation of discrete fault positions along the lines. It has been seen that a high number of fault positions is required to obtain reasonable accuracy in case of fault position method.
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