基于紫外成像法的绝缘子电晕放电影响因素试验研究

Test Study on Factors Influencing Insulator Corona Discharge with Ultraviolet Imagery Method

绝缘子局部电晕放电的紫外检测是判定在线运行绝缘子绝缘性能的重要手段之一。采用光子型紫外探测器检测降雨量、污秽、均压环布置方式等不同试验条件下绝缘子的局部电晕放电程度,统计了检测到的光子数均值,进而分析不同因素对绝缘子电晕放电的影响。结果表明,污秽加剧了绝缘子的局部电晕放电程度;降雨量与绝缘子局部电晕放电程度具有复杂关系;绝缘子局部电晕放电程度与外施电压幅值呈指数增长关系;高压端均压环对绝缘子串的局部电晕放电具有关键作用。

Ultraviolet detection of insulators＇ partial discharge is one of the most important methods for estimating the insulation performance of online insulators.Photon ultraviolet detector was used to analyze the influence of rainfall,pollution and different arrangement of grading ring on partial corona discharge.The mean photon number was statistically achieved.The test results indicate that the insulators＇ partial discharge can be intensified by pollution;there is a complicated relationship between rainfalls and insulators＇ partial corona discharge;the partial discharge intensity can be enhanced with applied AC voltage exponentially;the grading ring on HV side plays the key role in reducing the insulator partial discharge.