期刊
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
卷 29, 期 2, 页码 583-590出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TDEI.2022.3157920
关键词
Mathematical models; Dielectrics; Aging; Resistors; Power transformer insulation; Permittivity; Moisture; Fractional Poynting-Thomson (PT) dielectric model; frequency-domain dielectric spectrum; power transformer insulation system
资金
- National Natural Science Foundation of China [51307097]
This article proposes a method for quantifying the health condition of power transformer insulation system using the concept of resistor and fractional calculus. The dielectric model and parameter identification method are presented. The influence of moisture and aging on the dielectric model parameters is studied, showing a strong correlation between relaxation time and water content.
This article is aimed at quantifying the health condition of the power transformer insulation system through its frequency-domain dielectric characteristic by using the concept of the resistor and fractional calculus. In this regard, the dielectric model of the fractional Poynting-Thomson (PT) is proposed, and a mathematical model for parameter identification of the proposed model is presented. The shuffled frog leaping algorithm (SFLA) is used to realize the parameter identification and the fractional PT model parameters of the oil-paper samples under different insulation health conditions. The influence of moisture and aging on the fractional PT dielectric model parameters is experimentally studied. Results show that, with the increase in the water content within the insulation system, the parameters of the fractional PT model gradually decrease, and there is a strong correlation between the relaxation time and the water content. This facilitates the employment of the fractional PT model parameters to quantify the aging and moisture content of the power transformer insulation system.
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