基于紫外成像技术的瓷绝缘子串放电程度量化评估

Quantitative Assessment of Porcelain Insulator String Discharge Degree Based on UV Imaging Technology

为利用紫外成像技术对绝缘子串的放电程度进行量化评估,首先以稳定放电源和紫外成像仪搭建试验装置,研究了增益、距离、角度和风力4种参数对紫外成像结果的影响。然后利用瓷绝缘子串开展了一系列人工污秽试验,用紫外成像仪记录下绝缘子串在电压不断升高过程中的放电现象,从紫外检测视频中提取了光子数、光斑面积和光斑数量等指标,分析了其与绝缘子串放电强度的对应关系。稳定放电源试验发现,仪器增益、距离与紫外检测结果在一定范围内均存在指数关系,角度和风力对放电的影响可忽略不计。污闪试验研究发现,从视频中提取的指标与绝缘子串放电强度存在明显的正相关关系,根据指标数值大小可将放电分为电晕放电、间歇性电弧放电和持续性电弧放电3个等级,实现了利用紫外成像技术对绝缘子串放电强度进行量化评估的目的。研究成果对紫外成像技术的应用以及绝缘子串污闪预警具有重要意义。

In order to evaluate the discharge degree of insulator string using UV imaging technology, firstly, we set up a test device with stable discharge power supply and UV imager, and we studied the effects of 4 parameters, including in- strument gain, distance, angle, and wind force on the UV imaging results. Then, we carried out a series of artificial pollution tests by using porcelain insulator strings, and recorded the discharge phenomena of insulator strings in the pro- cess of rising voltage with a UV imager. Finally, we extracted three indexes from the ultraviolet detection video, and analyzed the relationship between the indexes and discharge intensity of the insulator strings. From the steady discharge test, it is found that there is an exponential relationship between the gain, the distance, and the UV detection results in a certain range, while the influence of angle and wind force on discharge is negligible. The study on the flashover test shows that there is a positive correlation between the indexes extracted from the vedios and the discharge strength of the insulator strings. According to the numerical value of these indexes, we can divide the discharge stage into three grades, including corona discharge, intermittent arc discharge, and persistent arc discharge. Moreover, we succeed in using UV imaging technology to evaluate the discharge degree of insulator string. The conclusion is of great significance to the ap- plication of UV imaging technology and the early warning of pollution flashover of insulator strings.