摘要
目前局部放电已作为绝缘状态质量监控的重要指标,根据变压器内部油纸绝缘的局部放电特性以及发展规律,对高空电磁脉冲(high altitude electromagnetic pulse,HEMP)损伤配电变压器后的工频剩余寿命评估提供数据支撑,本文通过针板电极结构在HEMP传导环境作用下,以千伏为单位的不同HEMP测量电压幅值和不同冲击次数来刻画不同损伤状态的油纸试品,进行油纸绝缘的工频放电特性研究,统计分析局部放电的宏观规律,进而在宏观角度揭示纳秒脉冲作用下的油浸纸损伤机理,即当纳秒脉冲达到一定幅值或一定冲击次数时,会使绝缘纸内部纤维松散,从而产生较为密集的龟裂,使其绝缘性能严重下降。
The partial discharge is widely regarded as an important index for insulation state monitoring at home and abroad.In this paper,the discharge characteristics of oil-paper insulation at working frequency under HEMP impact are studied by taking the oil-papers under different HEMP amplitudes and different impact times as examples under the condition of positive and negative HEMP of needle-plate electrode structure.The macroscopic law of partial discharge is statistically analyzed,and the damage mechanism of oil-papers under the action of nanosecond pulse is revealed from the macro perspective.The results show that when the nanosecond pulse reaches a certain amplitude or a certain number of impacts,the internal fibers of the insulating paper will be loose,resulting in more intensive cracks,which will seriously reduce its insulation performance.
作者
樊冉阳
李斯盟
秦锋
杨宇翔
崔树群
FAN Ranyang;LI Simeng;QIN Feng;YANG Yuxiang;CUI Shuqun(State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China;National Key Laboratory of Intense Pulsed Radiation Simulation and Effect,Xi’an 710024,China;School of Physics&Information Technology,Shaanxi Normal University,Xi’an 710119,China)
出处
《现代应用物理》
2024年第6期195-201,共7页
Modern Applied Physics
基金
强脉冲辐射环境模拟与效应全国重点实验室开放基金资助项目(SKLIPR2114)
国家自然科学基金资助项目(52007148,12305306)。
关键词
油纸绝缘
局部放电特性
配电变压器
高空电磁脉冲
损伤状态
oil-paper insulation
partial discharge characteristic
distribution transformer
high altitude electromagnetic pulse(HEMP)
damage state
