Abstract
Structural system reliability analysis of transmission lines is a useful tool in designing new lines and in evaluating or updating existing lines. This paper describes a practical approach to estimate the system reliability of existing lines. The problem is divided into two components: firstly, obtaining the reliability of typical supporting structures; and secondly obtaining the reliability of the complete line. The first step may be carried out using standard structural system reliability analysis methods. A number of computer programs are currently available for structural system reliability analysis; those programs which are specifically designed for the reliability analysis of transmission structures are briefly described. It is shown that the reliability of every supporting structure in the line need not be obtained. Only the reliabilities of typical structures are needed. Once this is accomplished, the second step is to estimate the reliability of the entire line. This can be carried out using a simple approximate relationship between the reliability of a fully-utilized supporting structure and the reliability of the complete line. Two numerical examples are used to illustrate how the reliability of a complete line may be estimated.
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