TRANSMISSION LINE RELIABILITY MODELS INCLUDING COMMON MODE AND ADVERSE WEATHER EFFECTS

This thesis illustrates the development and analysis of a group of transmission system models which include both common mode failures an adverse weather conditions. Both of these factors have been considered as separate phenomenon in previously developed models and as such have been subjected to individual and independent analysis. The models illustrated in this thesis are used to examine the sensitivity of selected reliability indices to individual parameter variation in the composite model. Valid date collection required an understanding of the use to be made of the data and the relative importance of the data elements in the subsequent analysis. Models such as those presented in this thesis can be used to examine the data needs and the sensitivity of the system indices to model and data approximations. Approximate equations are developed for calculating the system failure rate and average outage time in two and three line redundant configurations including both adverse weather and common mod considerations. These approximate equations are developed to permit relatively easy utilization of the studies. The results obtained using the approximate equations have been compared with those predicted by a theoretically accurate Markov approach. These equations are further extended including temporary and maintenance outage conditions