A Survey on Cigré and IEEE Procedures for the Estimation of the Lightning Performance of Overhead Transmission and Distribution Lines

This lecture focuses on lightning performance of transmission and distribution lines. Modeling procedures and source data recommended by CIGRE and IEEE are reviewed and compared. Emphasis is given to differences, when present, between procedures proposed in the two frameworks. First, transmission lines performance is covered, with special attention to statistical distribution of lightning current amplitude, to the attachment process, and to the assessment of the shielding failure and backflashover rates. Distribution lines performance is then dealt with, with special attention to electromagnetic coupling models, to statistical procedures to evaluate the line lightning performance, and to the influence of the distribution line configuration on the final results. Joint CIGRE-CIRED WGs have produced relevant documents that this lecture is in part aimed at summarizing and at comparing with what accomplished on the same subject within the IEEE framework. The need for re-assessment of data and modeling procedures is emphasized, and reference to new initiatives in this respect is also made.