| Title |
Evaluation of Insulating Oil by Terahertz Time Domain Spectroscopy |
| Authors |
김근주(Kim Geun-Ju) ; 전석기(Jeon Seok-Gy) ; 선종호(Sun Jong-Ho) ; 진윤식(Jin Yun-Sik) |
| Keywords |
Terahertz Time-Domain Spectroscopy ; Terahertz Wave ; Insulating Oil ; Refractive Index ; Absorption ; Dielectric Constant |
| Abstract |
A new method on the evaluation of insulation oil was proposed. Terahertz time-domain spectroscopy (THz-TDS) was applied to investigate the properties of the insulating oil. For the diagnostics of oil degradation, three kinds of oils have been analyzed by THz-TDS. The degraded oil showed different optical and electrical constants compared with a new one. Generally, the power absorption coefficient, the refractive index, the dielectric constant and loss tanδ of the oil increase as the aging of insulating oil proceed. And the characteristics of two kind of insulation oil, 1-4 and 7-4, was compared in terahertz spectral region. Difference in refractive index and complex dielectric constant has been observed between the samples. The results of this study suggest that THz-TDS is a promising new means for evaluating degradation and identification of insulating oil. |