Research On Lightning Protection Technology Of Transmission Line In Handan

With the rapid development of the grid, a sharp increase in the length of thetransmission line. Since many lines is inevitable to go through complex terrain andareas of high soil resistivity, taken various measures to improve lightningwithstanding level of transmission line is necessary. In order to reduce lossescaused by lightning, people are more in-depth understanding of lightning activityand innovativing some advanced lightning protection devices. To reduce lightningdamage on the power grid is urgent.Firstly, analyze the mechanism of lightning discharges and lightningover-voltage. Summarize the analysis methods of transmission lines lightningperformance and the calculation methods of lightning trip-out rate. Analyze theshortcomings of lightning warning technology.Secondly, a calculation method of transmission lines lightning trip-out rate isproposed which taking account the frequency voltage. By comparison with themethod without taking account the frequency voltage and the Monte Carlo method,the effectiveness of the method is validated.Finally, based on a typical lightning protection measures, use the ATP-EMTPto further analysis the impact of various measures to reduce the risk of lightningstrikes (Including line arresters, ground wire, reduce grounding resistance, etc.).Propose differentiation strategy of lightning protection to reduce the lightning riskof transmission line in Handan.