An Investigation of the Statistical Relationship between the 345 kv Transmission Line Length and the Outage Rate
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Finding the factors that are related to varying transmission outage rates has been one of the major concerns of the reliability practitioners in the electric power industry. One of the potentially influential factors is the length of the transmission line. In this paper, a random effects Poisson regression model is used to quantify the relationship between the outage rate to the transmission line length. The method suggested is applied to analyze two sets of the 345 KV transmission line outage data of the Commonwealth Edison Company: group 1 contains transmission lines that had been installed before January 1974; group 2 consists of the lines that have been installed since January 1974. Results indicate that in both cases there is a significant log linear relationship between the transmission line outage and the line length. However, the annual outage rate elasticity of transmission lines of group 2 turns to be 0.33 while that of group 1 is 0.64. This would imply apparent quality improvement on the transmission lines in group 2.
The article of record as published may be found at https://doi.org/10.1142/S0218539394000088
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