MODELLING OF POWER SYSTEM RELIABILITY ASSESSMENT

The paper presents the way of modelling a subsystem of the power system from the power supply interruption consumer's point. Results of reliability assessment indicate significant differences of results depending on the modelling and understanding of the input data. Valid reliability assessment can be performed only with excellent knowledge of the observed system, organization and rules. As an example of calculation, a simple transformer station 110 / x kV analysis is performed, considering the standard and improved model. The paper gives an overview of the different Markov models for simple transformer station and comparison of the results of reliability and availability. The improved model presented should contribute to better reliability and availability assessment results of observed subsystems.