The study of improved Fisher ratio for default diagnosis of power transformer

Improved Fisher ratio method is presented in default diagnosis of power transformer based on dissolved gas analysis. Owing to the disadvantages of Fisher ratio method in RBF network structure optimization, authors put forward using improved Fisher ratio method to select the RBF centers, optimize the network structure. The results show that the neural structure is simplified strongly, the converged precision and class separability is improved, and this method is satisfied to diagnosis the default of power transformer.