摘要
高压电气设备在实际运行过程中常伴随着持续的机械振动,为探究振动对极不均匀电场局部放电起始放电特性的影响,搭建了空气中振动条件下针板电极局部放电试验平台,采集了起始放电过程的局部放电信号,在工频电压下分别研究了电极间距、振幅、振动频率对局部放电起始过程的影响规律。研究结果表明:随着振幅增加,间隙最大电场强度增大,碰撞电离过程加剧,起始放电电压降低,负半周放电次数和放电量增加,正负半周放电相位扩大;随着电极间距增加,振动对电场不均匀程度影响减小,负半周起始放电过程受振动影响逐渐减弱;振动频率会影响起晕段内高场强区的作用时间,振动频率越高,带电粒子能够获得的最大动能越小,碰撞电离过程越微弱,放电的剧烈程度越低。
High-voltage power apparatuses are often accompanied by continuous mechanical vibration during operation.In order to explore the effect of vibration on the partial discharge inception characteristics under extremely inhomogeneous electric field,we built a test platform for partial discharge of needle-plate electrode under vibration conditions in the air,and collected the partial discharge signals of the inception discharge process.And we investigated the influence of electrode gap,amplitude and vibration frequency on partial discharge inception process under the power-frequency voltage.The results show that with the increase of the amplitude,the maximum electric field strength increases and the collision ionization process intensifies,the incipient discharge voltage decreases,the number of negative half-cycle discharges and the discharge volume increase,and the phase of positive and negative half-cycle discharges expand.As the electrode spacing increases,the impact of vibration on the unevenness of the electric field decreases,and the effect of vibration on inception discharge process of the negative half-cycle is gradually weakened.The vibration frequency affects the duration of high electric field within corona inception section,and the higher the vibration frequency,the smaller the maximum kinetic energy of charged particles,the weaker the collision ionization process,and the lower the intensity of discharge.
作者
刘云鹏
陈晓曼
郭佳熠
刘森
赵涛
LIU Yunpeng;CHEN Xiaoman;GUO Jiayi;LIU Sen;ZHAO Tao(Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense(North China Electric Power University),Baoding 071003,China;State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Beijing 102206,China)
出处
《华北电力大学学报（自然科学版）》
CAS
北大核心
2024年第4期1-8,共8页
Journal of North China Electric Power University：Natural Science Edition
基金
中央高校基本科研业务费专项资金资助项目(2022MS069)。
关键词
振动
局部放电
针板电极
交流电压
vibration
partial discharge
needle-plate electrode
AC voltage
