基于紫外脉冲和光学透镜的电晕放电检测技术研究

Research on Corona Discharge Detection Based on Ultraviolet Sensor and Optical Lens

电晕放电产生的紫外线可作为检测信号用于电晕放电识别。紫外成像仪成本昂贵,目前在输配电设备带电巡检中运用较多,但无法运用于实时在线监测,从而无法及时发现安全隐患。为此提出了一种基于紫外传感器的电晕放电监测方法,通过设计光学透镜以聚集紫外线信号从而抑制外界干扰,研究了传感器运行电压、监测距离对紫外脉冲计数监测结果的影响,并通过开展试验与紫外成像仪电晕放电图谱进行了对比验证。校验结果表明,紫外传感器供电电压设置为500V可以获得最佳检测效果;不同外施电压下紫外脉冲计数结果与紫外成像仪测得的光斑面积测得结果变化趋势基本一致,因此所提出的基于紫外脉冲计数的电晕放电监测方法可有效反应电晕放电的起始和发展。研究结果可以为输配电设备在线监测装备的研制和校验提供重要参考。

Ultraviolet radiation produced by corona discharge can be used as detection signal for corona discharge recognition.Ultraviolet imager is expensive,and it is widely used in live inspection of power transmission and distribution equipment,but it can't be used in real-time online monitoring,so it can't detect potential safety hazards in time.In this paper,a corona discharge monitoring method based on ultraviolet sensor is proposed.By designing an optical lens to collect ultraviolet signals to suppress external interference,the influence of the operating voltage and monitoring distance of the sensor on the monitoring results of ultraviolet pulse counting is studied,and the corona discharge pattern of the ultraviolet imager is compared with that of the experiment.The calibration results show that the best detection effect can be obtained by setting the supply voltage of the ultraviolet sensor to 500 V.The variation trend of the ultraviolet pulse counting results under different applied voltage is basically the same as that of the spot area measured by the ultraviolet imager.Therefore,the corona discharge monitoring method based on the ultraviolet pulse counting proposed in this paper can effectively reflect the initiation and development of corona discharge.The research results can provide important reference for the development and verification of on-line monitoring equipment for transmission and distribution equipment.