Air Breakdown During Fires

IntroductionIt has long been accepted that the insulationstrength of air depends upon the air density.Formost operating conditions,changes of the airdensity are due to the changes of the air pressure.However,the high temperatures are occasionallyencountered,for instance,forest fires occur closeto power lines[1] .Although much work has beencarried out at low temperatures,where thetemperature changes are small[2 4] ,there is arelative lack of information for high temperatures,where the pressure …     

Air Breakdown Behavior of Two Series Gaps for Composite Switching Impulse/Alternating Voltage

IntroductionThe conductor- rod gap,which represents some ofthe practical conditions,is known for its high gapfactor (about 1 .7) compared to reference gap(Rod- Plane gap) ,when a positive impulse isapplied to the conductor.This paper analyticallyinvestigates the external electrical performance ofaline rubber housed Zn O arresters in series withanother air gap case,in which the conductor- rodgap is in series with the spheres gap as a samplegap.Much previous work[13] has shown that thesparkove…     

高压脉冲放电降解染料废水的实验研究

染料废水是水处理领域的重点和难点。该文分别使用棒棒电极和多针 -板电极系统 ,基于水中脉冲放电法 ,研究了高压脉冲电流对多种典型染料废水的处理效果。实验表明 ,经过高压脉冲放电处理后 ,染料废水脱色效果明显 ,同时其试品含沉淀后的清液化学需氧量 T- COD值有明显升高。这说明高压脉冲放电所产生的臭氧、超声以及紫外辐射等可以有效地破坏染料废水中染料分子的发色基团和染料分子中的苯环以及萘环 ,有利于提高染料溶液的可生化性。但是电极形状对不同类型染料废水的处理效果有着一定影响。研究说明高压脉冲是处理染料废水潜在的有效途径。