Abstract. Application of V-type insulator string is most effective method in gale area to reduce wind deflection flashover, and dynamic characteristic of the V-type insulator string under action of pulse wind is an important factor to affect design of the V string. In order to clarify mechanical characteristic of the V-type insulator string under action of dynamic wind load, which is different to traditional rigid straight rod static mechanical method, finite element method is taken to calculate forcing of the V-type insulator string under action of pulse wind. Pulse wind speed time history with space relativity is considered and is converted to wind load time history, establishing non-linear finite element coupling model of insulator string -conductor, calculating mechanical characteristic of V-type insulator string under excitation of pulse wind, analyzing dynamic yield characteristic of the insulator under different angle of the V string, and providing theoretical basis for engineering design through comparison analysis between dynamic calculation result and static calculation result. IntroductionFollowing rapid development of our national economy, power demand of the whole society is increasing. Because the energy bases of our country are mostly located at the west area, energy resource optimization and configuration within the whole country scope can be realized through "Transmitting electricity from western to eastern, mutual power supply between southern and northern, national wide interconnection".In recent years, several windage yaw flashover accidents occurred in the power transmission line, therefore, the yaw flashover accident is an important safety hidden trouble for the normal operation of the grid, and it's not easy for the line to be reclosed after windage yaw accident, which seriously affects normal operation of the grid and causes great economic loss. Great windage yaw angle of the suspension insulator string is the direct reason for the windage yaw accident. Many newly constructed lines passing through the gale area, in order to reduce windage yaw of the insulator on the straight line tower, the V shaped insulator string is applied to reduce the windage yaw impact of the insulator. The V shaped suspension insulator string has been extensively applied in the domestic and foreign super-high voltage power transmission projects, which has many advantages of reducing size of the tower head, reducing steel consumption quantity, reducing width of the line corridor, saving cost of the line corridor, reducing filth accumulation on the insulator, increasing the self-cleaning capability, and preventing accident expansion during breakage of the insulator string etc. The V shaped insulator string can limit swing of the insulator. Since 2004, several string falling accident of the V shaped insulator string occurred in the power
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Numerical simulations for the output pressure and the shock response were performed using the hydrocode MSC.DYTRAN to analyze the effect of the combustion characteristics of main charges on the output shock of a typical igniter. The results are in good agreement with the experimental results. Numerical simulations were performed by changing the type of main charges. The results show that the differences in the gas production capacity of main charges have a greater effect on the output shock of the igniter than the reaction rate.
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