研究目的
To analyze the aging condition of transformer insulation paper using terahertz time-domain spectroscopy (THz-TDS) and provide a theoretical and experimental basis for detection.
研究成果
This work proves that THz technology could be used to detect the condition of transformer insulation paper after aging, and helped to establish a mathematical model between THz spectral parameters and aging.
研究不足
The experiment was carried out at room temperature (296 K) and the simulation was based on the temperature of 0 K, so the thermal effect was ignored. The above results lead to simulated absorption peaks that were less than that of the experiment.
1：Experimental Design and Method Selection
An accelerated thermal aging process was used to simulate the condition of paper insulation in transformer oil-paper systems. Optical parameters of the insulation paper after various aging intervals were analyzed with terahertz time-domain spectroscopy (THz-TDS) over the range 0.1~1.8 THz.
2：Sample Selection and Data Sources
The insulation oil was 25# ordinary mineral oil purchased from PetroChina Co., Ltd., and the paper was 0.5-mm-thick kraft paper produced by Sichuan EM Technology Co., Ltd.
3：List of Experimental Equipment and Materials
T-Spec terahertz time domain spectrometer (Ekspla, Inc., Vilnius, Lithuania), along with a photoconducting antenna illuminated by ultrashort laser pulses, was used for THz radiation and detection.
4：Experimental Procedures and Operational Workflow
The THz-TDS optical layout is illustrated in Figure 1. The experiment was carried out at room temperature of 296 K, and dry nitrogen was ?lled into the sample bin to avoid the effect of moisture. When acquisition of the THz spectrum, the THz pulses were focused on the surfaces of the samples vertically. And the average spectrum of 1024 time-domain scans was obtained as the spectrum of the test sample.
5：Data Analysis Methods
The Dorney and Duvillaret mathematical model of THz optical parameters was used to calculate the refractive index and the absorption coef?cient of the insulation paper over the range 0.1~1.8 THz.
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