Natural ester fluids applications in transformers as a sustainable dielectric and coolant

Hernandez-Herrera, Hernan; Ortega, Jorge Iván Silva; Mejia-Taboada, Mario; Jácome, Alfredo; Torregroza-Rosas, Melissa

doi:10.1063/1.5116976

Cited by 6 publications

(2 citation statements)

References 15 publications

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“…These characteristics of ester fluids, their breakdown strength, heat conduction, biodegradability, and high flash point, are important parameters which help to define their practical applications as insulating fluids in high-voltage power systems. Ester fluids are used as insulating liquids in power distribution transformers, and have also started to be employed in other categories of high-voltage and pulsed power systems [14,15]. Information on the basic electrical properties of insulating liquids is required for insulation coordination, and in the optimisation of practical high-voltage power systems and equipment.…”

Section: Introductionmentioning

confidence: 99%

Mobility of charge carriers in mineral oil and ester fluids

et al. 2021

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New, more stringent environmental requirements for electrical insulation liquids have led to the development of novel, more environment-friendly liquid dielectrics. Ester fluids, introduced several decades ago, provide a viable alternative to traditional mineral insulating liquids. In order to expand the practical applications of these novel dielectric fluids, their dielectric and electrical parameters should be established. One of the critical parameters that affects and governs the development of pre-breakdown processes in insulating liquids is the mobility of charge carriers. In the present paper, the mobility of charge carriers in commercially available synthetic and natural insulating ester fluids and in a mineral insulating oil were obtained using two methods, the time of flight and the space charge saturation current methods. The mobility was obtained for a wide range of electrical field magnitudes. It was found that the mobility of charge carriers is greater in the mineral oil than in both, the natural and synthetic, ester fluids. It was also established that the mobility is higher for higher applied electric field. The results of this work will help in characterizing liquid dielectrics and in optimizing high-voltage systems in which liquid dielectrics, including natural and synthetic ester fluids, are used.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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Section: Introductionmentioning

confidence: 99%

Mobility of charge carriers in mineral oil and ester fluids

et al. 2021

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“…The main shortcoming of this method is its availability only for the newly manufactured transformers. The second method [27][28][29] is replacing the mineral insulating oil with natural ester oil. The strength in using natural ester oil is the excellent specifications, such as higher cooling efficiency, lower inflammation risk due to high flash point value, and lower toxicity than mineral oil.…”

Section: Introductionmentioning

confidence: 99%

On Approaching Relevant Cost-Effective Sustainable Maintenance of Mineral Oil-Filled Electrical Transformers

et al. 2021

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Fire and explosion accidents of oil-filled electrical transformers are leading to negative impacts, not only on the delivery of energy, but also on workplace health and safety as well as the surrounding environment. Such accidents are still being reported, regardless of applying the regular maintenance strategy in the power plants. The purpose of this paper is to integrate a sustainability perspective into the maintenance strategy. The problem addressed is: how can we approach the relevant cost-effective sustainable maintenance for oil-filled electrical transformers? For this purpose, an empirical study in a power plant in Kuwait was introduced. The first stage was to carry out a sustainability assessment using the ABCD procedure. In this procedure, gaps to approach sustainability were identified and actions prioritized to close these gaps were demonstrated. Applying this procedure yielded an early fault diagnosis (EFD) model for achieving cost-effective sustainable maintenance using a fault trend chart based on a novel numerical method. Implementing this model resulted in an extension of the lifetime of transformers with suspected failure propagation, leading to a deferral of the replacement investment costs. The principal conclusion of this paper is the importance of viewing the maintenance strategy of transformers from a strategic sustainability perspective, in order to approach relevant cost-effective sustainable maintenance.

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