Jian Hao

TL;DR: In this article, a comparative study of physicochemical, ac breakdown strength and thermal stability behavior of BIOTEMP natural ester/pressboard insulation and Karamay 25# naphthenic mineral oil/press board insulation after long term thermal ageing was conducted.

TL;DR: In this paper, a new method for assessing the ageing condition of the oil-paper insulation in terms of the depolarization charge quantity was proposed, which can also be used to assess the condition of new insulation system using natural ester in transformers accurately.

TL;DR: In this paper, a review of the basic properties of traditional mineral insulating oil are first introduced, and the variation of electrical properties such as breakdown strength, permittivity, and conductivity during transformer operation and aging is summarized.

TL;DR: In this paper, the influence of moisture on the charge distribution in multi-layer oil-paper insulation system was investigated using the PEA technique under 6 kV, and it was shown that the higher the moisture content of the sample, higher the mobility of the trapped charges, and the more obvious the positive charge injection and negative charge injection were observed.

TL;DR: In this paper, the variation of the mechanical properties and solubility parameters of models with different polymerization degrees and force fields were analyzed to study the microscopic thermal aging mechanism of insulating paper cellulose through molecular dynamics simulation, it is important to select suitable DP and force field for the cellulose model to shorten the simulation time and obtain correct and objective simulation results.