Abstract
The paper investigates the improvement of the lightning performance of distribution lines due to the increase in the line critical flashover voltage (CFO) from 95 kV to 170 kV. Initially, a research project on lightning protection carried out in the 1980′s and the proposed modifications on the distribution line structures in order to increase their CFO are described. A methodology for the lightning flashover rate assessment, including the variation of the soil resistivity in a probabilistic model, is presented. Additionally, field data on the lightning performance of two rural distribution feeders, one with 95 kV CFO and the other with 170 kV CFO, are analyzed. Altogether, the feeders are approximately 1200 km long and are located in the same region. Their lightning performance refers to four years of operation and 3800 sustained power outages. The field data are compared with the theoretical assessment carried out using the proposed methodology as well as with the methodology used in the 1980′s, and the results are analyzed.
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