A technique for the measurement of dielectric loss of polyethylene insulated coaxial cables

D. Walters
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引用次数: 0

Abstract

The polyethylene dielectrics used in underwater communication cables have extremely low power factors at transmission frequencies: typically between 60 × 10−6 and 120 × 10−6 at 45 MHz, It is important to be able to measure the loss of the dielectric accurately before, during and after cable manufacture in order to determine the effects of contamination, processing, and working environment. Until now loss measurements with the required accuracy (∼1μR) could only be made using thin, circular specimens of the material as in the method described by Hartshorn and Ward {1}, Although this technique has given extremely accurate results, particularly as applied in the apparatus developed by Reddish and Buckingham {2}, the disadvantages of having to use flat moulded specimens as opposed to pieces of actual cable are obvious.
聚乙烯绝缘同轴电缆介电损耗的测量技术
水下通信电缆中使用的聚乙烯电介质在传输频率下具有极低的功率因数:通常在45 MHz时在60 × 10−6和120 × 10−6之间。为了确定污染,加工和工作环境的影响,能够在电缆制造之前,期间和之后准确测量电介质的损耗是很重要的。到目前为止,损耗测量所要求的精度(~ 1μ r)只能用Hartshorn和Ward{1}描述的方法使用薄的圆形材料样品进行测量。尽管这种技术已经给出了非常准确的结果,特别是在red和Buckingham{2}开发的仪器中应用时,必须使用扁平模压样品而不是实际电缆的缺点是显而易见的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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