电晕笼中直流导线起晕电压的测量方法

Measurement Methods for DC Conductor Corona Onset Voltage in the Corona Cage

电晕起始电压是反映导线电晕特性的重要参数。针对现有的电晕起始电压测量方法不能区分导线局部起晕电压和全面起晕电压的不足,在实验室使用的小电晕笼中测量了不同类型和表面状态的直流导线的起晕电压。通过分析导线电晕发展过程,提出使用电流系数曲线测量直流导线起晕电压的方法。与已有的测量方法进行对比的结果表明,结合使用电晕脉冲法和电流系数法测量电晕笼中直流导线的局部起晕电压和全面起晕电压是可取的。

The corona onset voltage is an important parameter to reflect conductor＇ s corona characteristics, therefore, the onset voltage of some different types and surface conductors were measured in the small corona cage used in the laboratory. The existed onset voltage measurement methods cannot distinguish the partial onset voltage and the overall onset voltage of transmission line. The process of corona onset and development was analyzed to present the current coefficient method which was used to estimate the onset voltage of DC conductors, and results of different methods were compared. Based on the experimental results, the corona impulse method and current coefficient method were recommended to measure the partial onset voltage and onset voltage of DC conductors in the corona cage respectively.