Application Reserach Of Lightningproof And Grounding Of UHVDC Transmission Project

Extra high voltage direct current transmission line is assumed to have a very important position in the power grid for long distance and large capacity transmission.The operation experience of 500 kV DC transmission lines shows that lightning is the most important factor for the flashover of HVDC transmission lines.So the lightning protection of line is very important to the safe operation of UHV DC transmission line.Due to the lightning performance of transmission lines along the different terrain conditions,wire parameters and tower design will impact on DC transmission line,so it is necessary for the lightning protection performance of UHV DC transmission lines for targeted research.Based on the statistics and analysis of the lightning activity parameters,the probability distribution function of the lightning current amplitude and the ground flash density are obtained.The comprehensive consideration of UHV DC transmission lines and the effects of topography,weather conditions around the tower outside vegetation risk factor evaluation method.With the analysis method of AHP lightning flashover risk assessment of UHV DC transmission line tower section.The measures for lightning protection of UHV DC transmission line are studied.Through the analysis,the selection of lightning protection and grounding measures,grounding device design.At the same time,through the analysis and application of the new type of grounding type,select the appropriate lightning protection grounding measures.