Study on Detecting Dielectric Properties of Typical Electrical Insulation Materials by Terahertz Wave Spectroscopy

IEEE Access

Fanghui Yin¹  Lanxin Li¹  Hongwei Mei¹  Liming Wang¹  Jianben Liu²  Wei Hu² 

[1] Graduate School at Shenzhen, Tsinghua University, Shenzhen, China;State Key Laboratory of Power Grid Environmental Protection, Wuhan Branch of China Electric Power Research Institute, Wuhan, China;

关键词: Broadband dielectric spectrometer;    dielectric properties;    insulation materials;    terahertz wave;   

DOI  :  10.1109/ACCESS.2019.2941798

来源: DOAJ

【 摘 要 】

The dielectric properties of the electrical insulation materials is of great importance to the safe operation of the power system. As a promising technique in the field of material testing and with the very adaptive physical modeling of wave transmission process, terahertz wave was used to measure the dielectric properties of five commonly used insulation materials by two methods in this paper. When excluding the echo pulse from the reference signal and the sample signal, a better signal-noise ratio and a wider effective frequency band of spectrums can be obtained. Alternatively, the dielectric properties can also be achieved by separating the main pulse and echo pulse from the sample signal. The latter method makes the sampling of reference signal unnecessary. Furthermore, the dielectric properties of materials were also measured on a relative lower frequency band (1Hz-1MHz) by the broadband dielectric spectrometer. Compared with a relatively lower frequency band, due to the polarization, the dielectric constant of the tested insulation materials was lower on the terahertz band while the dielectric loss tangent was generally higher except the epoxy resin.

【 授权许可】

Unknown