极不均匀电场中叠层间位芳纶纸和纤维素纸的局部放电特性对比分析  

Comparative Analysis of Partial Discharge Characteristics of Laminated PMIA Paper and Cellulose Paper in Extremely Inhomogeneous Electric Field

作　　者：律方成 杨瑞 宋景萱 吴雨舟 王双双 王胜辉 LU Fangcheng;YANG Rui;SONG Jingxuan;WU Yuzhou;WANG Shuangshuang;WANG Shenghui(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Beijing 102206,China;Qinhuangdao Power Supply Company,State Grid Jibei Electric Power Co.Ltd,Qinhuangdao 066000,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京102206 [2]国网冀北电力有限公司秦皇岛供电公司,河北秦皇岛066000

出　　处：《华北电力大学学报（自然科学版）》2024年第5期35-44,共10页Journal of North China Electric Power University：Natural Science Edition

基　　金：新能源电力系统国家重点实验室自主课题(重点);数字电网关键技术项目(2020YFB0906000).

摘　　要：间位芳纶纸具有优异的绝缘强度和耐热性,是纤维素纸的理想替代品。为研究干式工况下间位芳纶纸对纤维素纸的可替代性,对比了叠层间位芳纶纸和纤维素纸在极不均匀电场中的击穿强度,并对叠层间位芳纶纸与纤维素纸开展了阶梯升压和恒定电压下的局部放电测试。结果表明,极不均匀电场中间位芳纶纸的干式击穿电压约为纤维素纸的2倍,且随着叠层数的增长,二者的击穿强度差异性变小;升压局放中,在电场强度低于两种绝缘纸各自击穿强度的50%时,两种绝缘纸的放电特征相近,进一步提高电场强度后,间位芳纶纸出现了更剧烈的沿面放电,放电量约纤维素纸的6倍;恒压局放中,间位芳纶纸在放电起始阶段放电更为剧烈,最大放电量在6500~43000 pC之间变化,而后在6500 pC上下小幅度波动,临近击穿时最大放电量剧增到49966.9 pC。局放使间位芳纶纸呈现更加严重的纸张缺陷,这源于击穿对短切纤维与浆粕界面的破坏导致浆粕脱落及损伤。PMIA paper is an ideal substitute for cellulose paper because of its excellent insulation strength and heat resistance.We compared the breakdown strengths of laminated PMIA paper and cellulose paper in extremely inhomogeneous electric field in order to study the substitutability of PMIA paper for cellulose paper under dry working conditions,and carried out partial discharge tests under step-up and constant voltage for laminated PMIA paper and cellulose paper.The results show that the dry breakdown voltage of the PMIA paper in the extremely inhomogeneous electric field is about twice that of the cellulose paper,and the difference of the breakdown strength between the two becomes smaller with the increase of the number of layers.In the step-up partial discharge,the discharge characteristics of the two insulating papers are similar when the electric field strength is lower than 50%of the respective breakdown strength of the two insulating papers,and after further increasing the electric field strength,the PMIA paper shows a more intense discharge along the surface,and the discharge is about 6 times that of the cellulose paper.In the constant-voltage partial discharge,the discharge of PMIA paper is more intense at the beginning of the discharge phase,with the maximum discharge varying between 6500 and 43000 pC,then fluctuating slightly above and below 6500 pC,and the maximum discharge increases dramatically to 49966.9 pC near the breakdown.What’s more,partial discharge causes the PMIA paper to show a more severe degree of paper defects,which results from the breakdown of the interface between the short-cut fiber and the pulp.

关 键 词：间位芳纶纸 纤维素纸 击穿 局部放电 

分 类 号：TM211[一般工业技术—材料科学与工程]