水中大体积放电产生方法的研究  

Generation of Large Volume Discharges in Water

作　　者：朱太云[1] 王秀环[1] 张乔根[1] 杨兰均[1] 

机构地区：[1]西安交通大学电气工程学院,西安710049

出　　处：《西安交通大学学报》2008年第6期723-727,共5页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(50577053)

摘　　要：研究了一种脉冲电压下采用涂覆介质的球-环电极结构在水中产生多通道、辐射状、大体积流注放电的新方法.与以前方法相比,该方法能在较低电压幅值下在水中产生大体积放电.采用光学和电学手段,对流注放电通道的长度、数量、脉冲电压参数(如电压幅值和脉冲宽度)对放电的影响进行了研究.对电极介质涂覆条件下流注的产生与发展做出了理论解释.研究结果表明,水中放电的最大流注长度和通道起始点数均随脉冲电压幅值和脉冲宽度增加而增加.介质涂覆中局部电场的增强和微小缺陷的局部放电在水中形成气泡是水中流注放电起始的根本原因.A new method using dielectric-coated sphere-ring electrode was put forward to generate multiple, radial streamer discharges in tap water by applying a pulse voltage. Different from the previous methods by means of extremely high electric strength, this kind of electrode configuration enables to generate large volume streamer discharges in water easily under lower voltage. The effect of the pulse parameters, such as pulse amplitude and pulse width, on streamer channels length is investigated, and the influence mechanism of the coated-dielectric on the streamer initiation and propagation is discussed. The results demonstrate that with the increment of applied pulse amplitude and pulse width, the maximum length and the number of origin points of the streamer increase. The streamer discharges in water originate from the appearance of micro bubbles formed by the intensified electric field and the partial discharges in the dielectric coating.

关 键 词：水中放电 大体积放电 流注放电 脉冲功率 

分 类 号：TM89[电气工程—高电压与绝缘技术]