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The paper deals with the reliability-centered maintenance (RCM) of a transmission substation. The process of the planning and actual performance of maintenance was carried out using an optimization algorithm. This maintenance procedure represents the maintenance management and included reliability of the power system operation, maintenance costs, and associated risks. The originality of the paper lies in the integrated treatment of all maintenance processes that are included in the pre-processing and used in the optimization process for reliability-centered maintenance. The optimization algorithm of transmission substation maintenance was tested in practice on the equipment and components of an existing 400/110–220/110 kV substation in the Slovenian electricity transmission system. A comparison analysis was also carried out of the past time-based maintenance (TBM) and the new reliability-centered maintenance (RCM), on the basis of the optimization algorithm.

a b s t r a c tThis paper deals with analysing the impact of LV lines impedance on the operation of overvoltage protection, especially on the operation of gas discharge arresters. A model of the overvoltage protection with all elements (gas discharge arrester and metal-oxide surge arrester) was developed within a Simulink/Matlab environment for this purpose. This model of LV line is presented as a model for the computation of transients. Computations were carried out for various line lengths and various combinations of overvoltage protection elements. On the basis of analyzing the models responses, an analysis was made on the impact of the impedance of LV lines on the ability of self-extinguishing the gas discharge arrester. Some additional measures are also proposed for achieving the proper operation of overvoltage protection.