Assessing Reliability of Substation Spare Current Transformer System

摘要

This paper relates a case study involving Current Transformers (CTs) from the electrical system of the Companhia Hidro Eletrica do Sao Francisco (CHESF) in order to estimate the optimum number of spare. Two models have been considered in this work. The first and widely used in sparing analyses consists of an application of the Pois-son distribution to calculate the reliability of a system. The second is based on Monte Carlo simulation, in which any probability distribution and stochastic times can be used. The comparison between models has shown that the Monte Carlo model is more efficient due to its stochastic nature.