1.School of Electrical Engineering Dalian University of Technology Dalian 116024 China; 2.State Grid Electric Power Reseach Institute of Chongqing Electric Power Company Chongqing 401121 China
Abstract：High power laser triggered vacuum switch,due to its accuracy,reliability and anti-electromagnetic interference,has a very broad application prospects in many field,such as fast closing switch,electromagnetic emissions,series compensation capacitor protection.A flat electrode type laser triggered vacuum switch is presented.In order to improve its trigger life,the design of the trigger electrode is optimized.The designed trigger electrode can be effectively ablative resistant.TiH2 is used as target material,which can provide extensive initial plasma for the switch.The trigger performance of switch is improved,and the shortest delay is up to 650 ns.The relationship among the laser parameters,focus lens positions,applied voltages and the trigger characteristics which mainly contain the trigger threshold,minimum operating voltage and the delay time is analyzed in detail.Trigger threshold theory and arc ignition mechanism are proposed to explain the switch conduction,which can provide the theory basis of the design of the LTVS.Is the experiment can concluded that the stable trigger threshold can reach 4.5×107 W/cm2,and the minimum operating voltage observed is 30 V.Time delay under the normal focus mode can be effectively reduced.Furthermore,it is found that the process of laser-stimulated arc initiation is of a random nature.A short transition phase of strongly fluctuating exists.When the arc current value is beyond 5 A and the external voltage is high enough,the oscillation phenomenon disappears and the vacuum arc is ignited stably.
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2016, Vol. 31 
