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A method for the adaptive signal decomposition by using the frequency boundary information is proposed. This is achieved by the high-order derivative operation that could extract the frequency-domain boundary between the highest frequency portion and the rest parts of signal by using the proper order value and a subsection filtering method based on fast Fourier transform. Simulations show that the...
The Frequency Domain spectroscopy is a nondestructive electric diagnosis. It's very suitable for transformer oil-paper insulation condition of field detection, the actual development of the internal oil paper insulation status can be reflected accurately, especially in the low frequency and the ultra-low frequency. Because of the frequency domain dielectric spectroscopy at low frequency measurement...
In order to evaluate the effects of temperature on dielectric response, the frequency domain dielectric spectroscopy was transformed into temperature dielectric spectroscopy in this paper. Dealing with the data of the obtained temperature dielectric spectroscopy, and the changed slope of dissipation factor of the oil paper insulation samples was calculated at each temperature section. According to...
Periodogram is a simple and efficient way to detect sinusoidal signal in the frequency domain, but the optimum detector for single tone is considered to be matched filter method in the time domain. In this paper, the standard periodogram is compared to the matched filter method. Their performance at low signal-to-noise ratios (SNRs) and high SNRs are discussed respectively. Simulation results show...
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