Zone branch reliability methodology for analyzing industrial power systems

There are many methods available for evaluating the frequency and duration of load point interruptions within a given industrial power system configuration. As systems become larger and more interconnected, these existing methods can become computationally bound and limited in their ability to assess the impact of unreliable protective equipment and unreliable protection-coordination schemes on individual load point reliability indices within a given plant configuration. These methods also often cannot account for complex isolation and restoration procedures within an industrial plant configuration. This paper presents a zone branch methodology that overcomes many of these limitations and applies the methodology to a large industrial plant power system configuration. The primary advantage of the zone branch methodology is that it can readily identify faulty protection schemes involving all the components of an industrial power system and evaluate load point reliability indices