Degradation diagnosis of transformer insulating oils with terahertz time-domain spectroscopy

We report the frequency-dependent complex optical constants, refractive index and absorption, and complex dielectric properties over the frequency range from 0.2 to 3.0 THz for aged power transformer mineral insulating oils. These results have been obtained using terahertz time-domain spectroscopy (...

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Bibliographic Details
Published in:Journal of the Korean Physical Society 2017, 71(12), , pp.986-992
Main Authors: Kang, Seung Beom, Kim, Won-Seok, Chung, Dong Chul, Joung, Jong Man, Kwak, Min Hwan
Format: Article
Language:English
Subjects:
Diagnostic systems
Dielectric properties
Insulation
Mathematical and Computational Physics
Molecular dynamics
Optical properties
Particle and Nuclear Physics
Physics
Physics and Astronomy
Refractivity
Spectrum analysis
Theoretical
Time domain analysis
Transformers
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Summary:We report the frequency-dependent complex optical constants, refractive index and absorption, and complex dielectric properties over the frequency range from 0.2 to 3.0 THz for aged power transformer mineral insulating oils. These results have been obtained using terahertz time-domain spectroscopy (THz-TDS) and demonstrate the double-Debye relaxation behavior of the mineral insulating oil. The measured complex optical and dielectric characteristics can be important benchmarks for liquid molecular dynamics and theoretical studies of insulating oils. Due to clear differences in THz responses of aged mineral insulating oils, THz-TDS can be used as a novel on-site diagnostic technique to monitor the insulation condition in aged power transformers and may be valuable alternative to characterize other developing eco-friendly insulating oils and industrial liquids.
ISSN:0374-4884
1976-8524
DOI:10.3938/jkps.71.986