气体类型对正极性重复方波电压下PEEK沿面放电特性的影响  

Influence of Gas Type on Surface Discharge Characteristics of PEEK Under Positive Repeti-tive Square Voltage

作　　者：裘朱钢 李学宝[1] 李叶 赵志斌[1] QIU Zhugang;LI Xuebao;LI Ye;ZHAO Zhibin(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学新能源电力系统全国重点实验室,北京102206

出　　处：《高电压技术》2023年第12期5260-5269,共10页High Voltage Engineering

基　　金：国家电网有限公司科技项目(5500-202158435A-0-0-00)。

摘　　要：为研究不同气体对电力电子器件绝缘材料沿面放电特性的影响,分别测量了SF6、N_(2)和空气中正极性重复方波电压下聚醚醚酮(polyetheretherketone,PEEK)的沿面放电电流脉冲,详细分析了3种气体中PEEK的沿面放电起始电压(partial discharge initial voltage,PDIV)、放电电流脉冲波形参数以及放电平均时间延迟。测量结果表明,在相同条件下,SF6中PEEK沿面放电起始电压最高,N_(2)中次之,空气中最低;SF6中放电电流脉冲的幅值远小于N_(2)和空气的值,且正向放电脉冲幅值略小于反向放电脉冲幅值,N_(2)和空气中正向放电脉冲幅值大于反向放电脉冲幅值,且N_(2)中两者的差值更大;SF6中放电平均时间延迟最大,N_(2)中次之,空气中最小,SF6中反向放电时间延迟大于正向放电时间延迟,反向放电的加速因子大于正向放电的加速因子;N_(2)和空气中反向放电时间延迟小于正向放电时间延迟,反向放电的加速因子小于正向放电的加速因子。在已有研究的基础上提出PEEK在SF6中的沿面放电模型,对比不同类型气体下的放电特性差异,解释SF6气体环境中PEEK的沿面放电机制。In order to study the effects of different gases on the surface discharge characteristics of insulating materials of power electronic devices,the surface discharge current pulses of polyetheretherketone(PEEK)under positive repetitive square voltage in SF6,N_(2) and air are measured respectively,and the surface partial discharge initial voltage(PDIV),dis-charge current pulse parameters and average discharge time-lag of PEEK in three gases are analyzed in this paper.The results show that,under the same conditions,the PDIV of PEEK is the highest in SF6,followed by N_(2),and the lowest in air.In SF6,the amplitude of the discharge current pulse is much smaller than that in N_(2) and air,and the amplitude of the forward discharge pulse is slightly smaller than that of the backward discharge pulse.In N_(2) and air,the amplitude of the forward discharge pulse is larger than that of the backward discharge pulse,and the difference is larger in N_(2).The average discharge time-lag is the largest in SF6,followed by N_(2),and the smallest in air.In SF6,the backward discharge time-lag is larger than the forward discharge time-lag,and the acceleration factor of backward discharge is larger than that of forward discharge.In N_(2) and air,the time-lag of backward discharge is smaller than that of forward discharge,and the acceleration factor of backward discharge is smaller than that of forward discharge.Based on the existing research,this paper proposes a surface discharge model of PEEK in SF6,compares the differences in the discharge characteristics under different types of gases,and explains the surface discharge mechanism of PEEK in the SF6 gas environment.

关 键 词：正极性重复方波电压 PEEK 沿面放电 SF6 时间延迟 

分 类 号：TM21[一般工业技术—材料科学与工程] TM855[电气工程—电工理论与新技术]