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湿度对绞线正极性电晕电流脉冲及其无线电干扰影响的实验

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Keywords: 湿度,电晕电流脉冲,直流电晕,无线电干扰,功率谱

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Abstract:

为研究湿度对直流电晕无线电干扰的影响,搭建了直流绞线电晕放电实验平台,将相对湿度作为单一变化因素,使其在40%~85%范围内变化,采用试验导线终端匹配技术,通过准确测量直流绞线上的电晕电流脉冲,研究湿度对正极性电晕电流脉冲特性及其无线电干扰的影响。在湿度增加过程中,发现以下规律新的放电点会形成,但它们产生的电晕电流脉冲峰值通常较小;电晕电流脉冲的平均峰值减小;电晕电流脉冲重复频率先增加后减小,在相对湿度60%~75%达到最大;在相对湿度40%~60%范围内,电晕电流脉冲上升时间、半峰值时间及持续时间显著减小,而在60%~80%范围内,无明显变化规律;电晕电流脉冲功率谱减小,这也说明了湿度增加会使电晕电流脉冲产生的无线电干扰减小。

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