Probabilistic characterization of restoration times for a large real distribution system

– This paper deals with assessing the probability density functions of time to failure, reclosure time and restoration time for urban electricity distribution systems. This assessment is performed on the basis of a set of data representing the faults occurred in a 6.3 kV real urban distribution system over two years of operation. Results of various goodness-of-fit statistical tests (chi-square, Kolmogorov-Smirnov and geometrical adaptation) are presented, showing that the time to failure can be represented with the exponential distribution, while the reclosure time and the restoration time exhibit a satisfactory fit with respect to the Gamma distribution.

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