X射线激励XLPE电缆终端金属颗粒局部放电的研究  

Study on Partial Discharge of Metal Particles in XLPE Cable Terminal Excited by X-Ray

作　　者：郑书生 孔举 戴敏婷 刘志超 张宗衡 吴诗优 Zheng Shusheng;Kong Ju;Dai Minting;Liu Zhichao;Zhang Zongheng;Wu Shiyou(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University,Beijing 102206 China;Chengde Power Supply Company State Grid Jibei Electric Power Co.Ltd.,Chengde 067000 China;Nanchang Power Supply Branch of State Grid Jiangxi Electric Power Corporation,Nanchang 330069 China)

机构地区：[1]新能源电力系统全国重点实验室(华北电力大学),北京102206 [2]国网冀北电力有限公司承德供电公司,承德067000 [3]国网江西省电力有限公司南昌供电分公司,南昌330069

出　　处：《电工技术学报》2025年第3期913-927,共15页Transactions of China Electrotechnical Society

摘　　要：金属颗粒是电缆附件的典型缺陷之一,然而微小的金属颗粒缺陷局部放电难以检测。为此,该文提出了用X射线激励电缆终端金属颗粒缺陷局部放电的方法。首先,在电缆终端模拟实验模型上研究了X射线照射对不同电场分布、不同规格尺寸金属颗粒缺陷局部放电的影响;其次,探究了不同X射线强度下缺陷模型的放电特性;最后,在10 kV电缆终端上对该方法进行了测试。结果表明,X射线照射能降低金属颗粒缺陷的局部放电起始电压,降低幅度在11.4%~29.3%之间;与无X射线时相比,X射线照射能增大金属颗粒缺陷的放电重复率,增大幅度在36.1%~726.2%之间;X射线对金属颗粒缺陷的放电量无明显影响;X射线强度越高,对缺陷放电次数的激励效果越明显。在10 kV电缆上的测试结果验证了该方法的可行性,研究结果可为电缆附件缺陷局部放电检测提供一种新的手段。The discharge signal of small metal particle defect in cable terminal is weak,and the sensitivity of traditional partial discharge detection method is constrained.Recently,The method of using X-ray to excite the internal air gap of solid insulation to produce partial discharge has been applied in engineering.Different from the single air gap defect,the cable metal particle defect has both metal and air gap coexisting.It will aggravate the electric field distortion at the defect.On the other hand,the metal can supply initial electrons via field emission,surface photoelectric emission.The impact of X-ray on the partial discharge of such defect is unclear.To address these issues,this paper proposes a method of using X-ray to excite the partial discharge of metal particle defect in cable terminal,and the feasibility of the method is verified by experiments.Firstly,partial discharge measurement experiments under X-ray irradiation were conducted on metal particle defects with different electric field distributions and different sizes on the cable terminal simulation model.The effects of X-ray on the partial discharge inception voltage,discharge repetition rate and apparent discharge amount of defect were analyzed.Secondly,the X-ray tube voltage was varied to investigate changes in the discharge characteristics of the defect under different intensities of X-ray irradiation.Thirdly,the influence mechanism of X-ray on the partial discharge of metal particle defect was analyzed in terms of discharge inception field strength and initial electrons.Finally,the feasibility of the proposed method was tested on a 10 kV cable terminal.The test results show that X-ray irradiation can reduce the partial discharge inception voltage for metal particle defect with different electric field distributions and different sizes,with the reduction range from 11.4% to 29.3%.Compared with no X-ray,X-ray irradiation can increase the discharge repetition rate of metal particle defect,with an increase of 36.1%~725.9%.X-ray has no significant effe

关 键 词：X射线 电缆附件 界面金属颗粒 局部放电 

分 类 号：TM85[电气工程—高电压与绝缘技术]