模拟环氧树脂绝缘内部自然气泡的局部放电特性研究

Study on Partial Discharge Characteristics of Simulated Natural Air Gap Inside Epoxy Resin Insulation

在环氧树脂绝缘材料气隙中发生的局部放电(PD)现象是导致绝缘性能下降的关键因素,其检测与诊断对评估材料的绝缘状态至关重要。现有研究多集中于制备人工缺陷样品并以此探究局部放电现象,但对缺陷模型的现实符合性及局部放电与气隙尺寸的具体关系尚缺乏深入探讨。因此,本研究提出了一种模拟绝缘材料内部气隙缺陷的实用方法,并通过三种类型的传感器对局部放电进行测量,分析了气隙尺寸对放电过程的影响。运用快速傅里叶变换(FFT)对放电信号频率进行分析,揭示了放电幅度和频率与气隙大小之间的显著相关性。该研究结果不仅为理解环氧树脂材料内部气隙对局部放电特性的影响提供了新的视角,而且为绝缘材料的缺陷诊断和寿命预测提供了重要的理论依据。

The partial discharge(PD)phenomenon occurring in the air gap of epoxy resin insulation materials is a key factor leading to a decrease in insulation performance,and its detection and diagnosis are crucial for evaluating the insulation state of the material.Existing research has mostly focused on preparing artificial defect samples and exploring the phenomenon of partial discharge,but there is still a lack of in-depth exploration on the practical conformity of defect models and the specific relationship between partial discharge and air gap size.Therefore,this study proposes a practical method for simulating air gap defects inside insulation materials,and measures partial discharge through three types of sensors to analyze the influence of air gap size on the discharge process.The frequency of the discharge signal was analyzed using fast Fourier transform(FFT),revealing a significant correlation between the discharge amplitude and frequency and the size of the air gap.The research results not only provide a new perspective for understanding the influence of internal air gaps in epoxy resins on partial discharge characteristics,but also provide important theoretical basis for defect diagnosis and life prediction of insulation materials.