天然酯绝缘油-纸界面的多分支流注放电仿真  

Simulation of multi-branching streamer discharge at natural ester insulating oil-paper interface

作　　者：陈刚[1] 辛晓军 宋普查 王开正 罗莉[1] CHEN Gang;XIN Xiaojun;SONG Pucha;WANG Kaizheng;LUO Li(School of Electronic Information and Electrical Engineering,Chengdu University,Chengdu 610106,China;School of Electrical Power Engineering,Kunming University of Science and Technology,Yunnan 650093,China)

机构地区：[1]成都大学电子信息与电气工程学院,四川成都610106 [2]昆明理工大学电力工程学院,云南昆明650093

出　　处：《电力工程技术》2024年第4期245-252,共8页Electric Power Engineering Technology

基　　金：国家自然科学基金资助项目(52107017)。

摘　　要：油-纸界面的局部放电是油浸式变压器中油-纸绝缘失效的主要原因之一。文中在多分支流注放电数值模型的基础上进一步考虑油-纸界面的电荷输运特性,构建油-纸绝缘系统中的多分支流注放电模型,并利用有限元法分别对天然酯绝缘油和绝缘纸介电常数配比、针电极与纸板的间距影响下的沿面放电特性进行研究。结果表明,针电极与纸板的间距及绝缘油与绝缘纸的介电常数配比均会显著影响流注分支;针电极与纸板的间距越小,油-纸界面处的流注分支间的抑制越明显,油-纸界面的流注对z-轴流注的影响更显著;当绝缘油介电常数比纸板大时,流注在油中的发展和分支更为显著,反之则流注更易沿纸板表面发展及在油-纸界面聚集电荷。Partial discharge at the oil-paper interface is one of the main reasons for the failure of oil-paper insulation in oil-immersed transformers.In this article,based on the numerical model of multi-branching streamer discharge,a multi-branching streamer discharge model in oil-paper insulation system is constructed by further considering the charge transport characteristics of oil-paper interface.The surface discharge characteristics under the influence of the dielectric constant ratio between natural ester insulating oil and insulating paper,and the spacing between needle electrode and paperboard are studied by finite element method,respectively.The results show that the distance between the needle electrode and the paperboard,and the dielectric constant ratio of insulating oil and insulating paper both significantly affect the streamer branching.The smaller the clearance between the needle electrode and paper-board is,the more serious the inhibition of streamer branches at the oil-paper interface is,which resulting in the streamers near the oil-paper interface are more significant effect on the propagation of the z-axis streamer.When the dielectric constant of the insulating oil is larger than that of the paperboard,the development and branching of the streamer in the oil will be more significant.On the contrary,the streamer is more likely to develop along the surface of the paperboard and accumulate charge at the oil-paper interface.

关 键 词：天然酯绝缘油 放电模型 流注放电 电场 空间电荷 油-纸界面 

分 类 号：TM215[一般工业技术—材料科学与工程]