Updated experiences of DGA with natural esters and current state of international guides

Meira, Matias; Álvarez, Raúl Emilio; Verucchi, Carlos; Catalano, Leonardo J.; Mayora, Hernan

doi:10.1109/icd46958.2020.9341883

Cited by 2 publications

(1 citation statement)

References 27 publications

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“…The commonly used fault diagnosis method is dissolved gas analysis (DGA). The pyrolysis research of vegetable oil is also helpful to establish the DGA method in vegetable insulating oil [12][13][14]. DGA is a chemical diagnostic tool that plays a vital role in the power industry.…”

Section: Introductionmentioning

confidence: 99%

Investigation on micro‐mechanism of palm oil as natural ester insulating oil for overheating thermal fault analysis of transformers

Zheng

Li²,

Feng³

et al. 2021

High Voltage

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In order to explore the pyrolysis mechanism of palm oil as the natural ester insulating liquid from the molecular aspect, the ReaxFF reactive force field was used to simulate the pyrolysis process of palm oil. Firstly, the molecular models of the four main molecules of palm oil—tripalmitin, trilinolein, triolein, and tristearin—are constructed via density functional theory (DFT). Secondly, the vibrational frequencies of the four molecules are calculated, so as to calculate the infrared (IR) spectra. Thirdly, molecular dynamics (MD) simulations employing the ReaxFF method are performed to simulate the pyrolysis reaction of the palm oil system under different temperatures, so as to observe the generation pathways of major products used in the dissolved gas analysis (DGA) in the transformer thermal fault analysis. Finally, hydrogen bonds in the pyrolysis process are counted. It is found that the number of hydrogen bonds gradually increased with the increase of pyrolysis time and pyrolysis temperature. It reveals why the life of the insulating paper immersed with natural esters is prolonged, and why the breakdown voltage is reduced slowly in the actual experiment from another perspective. This study can provide theoretical guidance and effective reference for the thermal fault analysis of an insulating liquid using palm oil as raw material.

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Section: Introductionmentioning

confidence: 99%