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For the analysis of back‐flashover phenomena of transmission lines, accurate evaluation of flashover occurrence at arcing horns is necessary. In this paper, parallel gap flashover phenomena are studied theoretically in the following conditions: (i) the gap lengths are different, and (ii) after one of the gaps flashes overs, there remains some residual voltage. The formulae for the occurrence probabilities of concurrent flashover on these conditions are introduced. Based on the analysis, application to the analysis of multiphase flashover is discussed. © 2018 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. [ABSTRACT FROM AUTHOR]

The characteristics of lightning strikes on wind turbine blades have been investigated by model experiments with real turbine blades. The effects of various types of receptors, the polarities of the applied voltages, and pollution on the blade surface are clarified. Based on these experimental results, lightning protection design of actual wind turbine blades by receptors is discussed. © 2011 Wiley Periodicals, Inc. Electr Eng Jpn, 176(3): 8-18, 2011; Published online in Wiley Online Library (). DOI 10.1002/eej.21143 [ABSTRACT FROM AUTHOR]