DELIVERY POINT RELIABILITY MEASUREMENT

Reliability is one of the most important criteria which must be taken into consideration during the planning, designing, and operating phase s of any industrial, commercial, or utility power system, Two distinct reliability assessment methodologies are frequently used to evaluate the reliability performance of power systems, They are: 1) historical reliability assessment, i,e,, the collection and analysis of system ou tage data, and 2) predictive reliability assessment, i,e,, combining h istorical outage data and theoretical models to estimate the performan ce of various power system operating configurations, This paper will f ocus on the historical assessment of the sustained frequency and durat ion of single circuit and multicircuit delivery point interruptions, D elivery point reliability levels have a significant impact on the desi gn of industrial and commercial power systems (e.g., IEEE Gold Book-IE EE Standard 493), Bulk electricity system average reliability performa nce indices are defined and statistics based on delivery point sustain ed interruption data for a five-year period from 1988 to 1992 are pres ented and discussed in detail in this paper.