Corona Discharge Images under DC and AC voltages

This paper presents the corona discharge light patterns for three different electrode systems under +DC, -DC, and AC voltages and also compares the availability of corona discharge detection sensors. The electrode gap spacing was selected as 6 cm for these electrode systems to observe several corona discharge modes under atmospheric air. Using a digital single-lens reflex (DSLR) camera, corona discharge light patterns were captured from the corona initiation to the gap breakdown. The resultant corona light discharge patterns were compared according to electrode type, voltage type, and voltage level. Also, corona discharge pulses were investigated using a highfrequency current transformer (HFCT) or a shunt resistor, and an acoustic sensor measured the sound levels generated by corona discharges. The light intensities of corona modes, corona inception voltages, and extinction voltages were identified via a corona camera. The key motivations of this study are to create a dataset of corona light patterns for different electrodes at various voltage levels and to conduct a severity analysis using these images. In addition, the study shows the practicability of digital cameras for corona discharge detection compared to costly corona detection equipment like corona cameras and the inability of the other sensors to identify some corona discharge modes.本研究针对三种不同电极系统，分别在正直流（+DC）、负直流（-DC）与交流（AC）电压下开展电晕放电光场特性实验，并对比了不同电晕放电检测传感器的检测可用性。本次实验选取6 cm的电极间隙间距，以在常压空气环境下观测多种电晕放电模式。本研究采用数码单镜头反光（DSLR）相机，采集了从电晕起始到间隙击穿全过程的电晕放电光场图像。基于电极类型、电压类型与电压幅值，对所得电晕放电光场图像进行了对比分析。此外，本研究采用高频电流互感器（HFCT）与分流电阻（shunt resistor）对电晕放电脉冲展开了测试，并通过声传感器采集了电晕放电产生的声压级信号。通过电晕相机识别了不同电晕模式的光强、电晕起始电压以及熄弧电压。本研究的核心目标在于构建涵盖不同电极、不同电压幅值下的电晕放电光场图像数据集，并基于该数据集开展放电严重程度分析。此外，相较于电晕相机等高价专用电晕检测设备，本研究证实了数码单反相机用于电晕放电检测的可行性，同时也验证了其余传感器无法识别部分电晕放电模式的局限性。

搜集汇总

背景与挑战

背景概述

该数据集包含在交流、正直流和负直流电压下的电晕放电图像，使用三种不同电极类型（锥形棒-平面、半球形棒-平面、半球形棒-半球形棒）和数码单反相机拍摄，覆盖从电晕起始到间隙击穿的整个过程。图像反映了电晕放电光模式随电压类型、电压水平和电极类型的变化，实验在大气空气条件下进行，适用于电力与能源领域的研究。