为了对空气中电晕放电强度进行评估,搭建了一套能够同时采集光电脉冲信号的局部放电光、电联合检测系统,并设计了典型的针-板电极缺陷.通过对不同外施电压下光、电脉冲特性的研究,发现光电脉冲在时间上有很好的一致性,且在放电负半周期,光电联合检测到的放电重复率随外施电压升高而增大;在外施电压正半周期,光脉冲幅值与视在放电量存在较好的线性关系,而在负半周期电压较低时,光脉冲幅值与视在放电量无线性关系,且随着外施电压不同,正半周期光、电脉冲相位分布谱图呈现"包络"状.结果表明:通过光电联合检测得到的放电重复率、脉冲幅值及相位分布谱图特征可对电晕放电剧烈程度进行判断.
To evaluate the intensity of corona discharge in air, an optical and electrical partial discharge detection system was set up which could collect light and current pulse signals simultaneously. The typi-cal neddle-plate electrode defects were designed. By studying the characteristics of light and current pulse under different applied voltages, we found that the light and current pulse signals had good consistency in time. In the negative half cycle of discharge, the discharge repetition rate increases with the increase of applied voltage. In the positive half cycle of discharge, there is good linear relationship between the light pulse amplitude and apparent discharge magnitude, but there is unlinear relationship between the light pulse amplitude and apparent discharge magnitude when the voltage of positive half cycle is low. Furthermore, the PRPD spectra of light and current pulse presents"envelop"shape. Therefore, the inten-sity of corona discharge could be evaluated by the discharge repetition rate, pulse amplitude, and PRPD spectra tested by light and current pulse joint detection.
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