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电网技术  2006 

变压器局部放电检测用特高频传感器的结构参数对其幅频特性的影响

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Keywords: 特高频局放检测,阿基米德螺旋天线,平面等角螺旋天线,幅频特性,变压器,高电压与绝缘技术

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Abstract:

传感器是变压器特高频局放检测中的关键设备之一,阿基米德螺旋天线和平面等角螺旋天线是目前常用的特高频传感器,采用扫频法在吉赫横电磁波室内测量了一系列结构参数不同的这两种螺旋天线的幅频特性,并在空旷场地测量了它们的驻波比。测试结果表明天线内外径尺寸对其幅频特性的影响比较明显;测试天线的驻波比小于2,能满足工程测试的要求;变压器局放检测应选用宽频带特高频传感器;平面等角螺旋天线适合应用于局放检测,阿基米德螺旋天线适合用于局放时延定位研究。

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