基于三电极的低温环境正流注传播特性

低温将给电气绝缘带来考验,而当前针对极寒条件下的气体放电特别是流注放电的研究仍比较少。通过搭建低温环境流注试验平台以及干燥空气系统,在平板结构三电极基础上新增棒板结构三电极,并利用光电倍增管和ICCD光学检测设备对正流注传播特性进行研究,得到了传播速度、发光强度等物理量的低温特性。试验结果表明:低温对流注放电具有抑制效应;流注起始场强(电压)随温度呈指数变化;传播速度随电压增大而指数增大,分散性随电场不均匀性增大而增大;发光强度随电压增大而线性增大,随电场不均匀性增大而增大。

Characteristics of Positive Streamer in Low Temperature Environment Based on Three-electrode Device

Low temperature will test the insulation strength of power grid,and existing researches on discharges especially the streamer under psyshro-environment are still rare.In this paper,we establish a chamber and a dry air station to achieve a low temperature,and use devices of plane-plane and rod-plane in three-electrode form to create fields of different uniformities.Two photomultiplier tubes and an ICCD are used to detect the streamer,and velocities and luminous intensities are obtained and discussed.Results show that there is an inhibiting effect from the low temperature on streamer,and the initial voltage varies exponentially with temperature;the velocity follows a power function with the voltage,and its dispersion increases with the rising of field inhomogeneity;the luminous intensity increases linearly with the field rising,and increases with the field inhomogeneity enhancing.