METHOD FOR RELIABILITY-ANALYSIS OF INDUSTRIAL DISTRIBUTION-SYSTEMS

The method for reliability analysis of industrial distribution systems presented in this paper combines a Monte Carlo simulation with an ele ctrical network model. The Monte-Carlo simulation generates fail and r estore events in stochastic components. The flexibility of the Monte C arlo simulation made it possible to include ageing of components and p reventive maintenance. As industrial loads are often sensitive to shor t-duration voltage sags, the influence of these sags had to be include d in the model. This is done by using the maximum permissible voltage sag at the load nodes as an interruption criterion. The occurrence of a short-circuit and the intervention by the protection are modelled in detail. Mal-trips as well as fail-to-trip of the protection are inclu ded. The method presented in this paper is suitable for industrial (an d other) distribution systems where sensitive loads are present, where maintenance of components is important and/or where the behaviour of the protection influences the reliability.