Natural Ester Dielectric Fluid Development

McShane, C.P.; Corkran, J.; Rapp, Kevin; Luksich, J.

doi:10.1109/tdc.2006.1668445

Cited by 54 publications

(23 citation statements)

References 3 publications

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“…Since the 1990s, work on suitability of NE as insulation for power industrial applications in natural conditions, mixed with mineral oil or commercially produced as synthetic forms have been widely reported [2][3][4][5]. For instance, NE can be synthesized into several derivatives with different molecular structures and physiochemical properties.…”

Section: Introductionmentioning

confidence: 99%

Influence of Conductive and Semi-Conductive Nanoparticles on the Dielectric Response of Natural Ester-Based Nanofluid Insulation

et al. 2018

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Nowadays, studies of alternative liquid insulation in high voltage apparatus have become increasingly important due to higher concerns regarding safety, sustainable resources and environmentally friendly issues. To fulfil this demand, natural ester has been extensively studied and it can become a potential product to replace mineral oil in power transformers. In addition, the incorporation of nanoparticles has been remarkable in producing improved characteristics of insulating oil. Although much extensive research has been carried out, there is no general agreement on the influence on the dielectric response of base oil due to the addition of different amounts and conductivity types of nanoparticle concentrations. Therefore, in this work, a natural ester-based nanofluid was prepared by a two-step method using iron oxide (Fe 2 O 3 ) and titanium dioxide (TiO 2 ) as the conductive and semi-conductive nanoparticles, respectively. The concentration amount of each nanoparticle types was varied at 0.01, 0.1 and 1.0 g/L. The nanofluid samples were characterised by visual inspection, morphology and the dynamic light scattering (DLS) method before the dielectric response measurement was carried out for frequency-dependent spectroscopy (FDS), current-voltage (I-V), and dielectric breakdown (BD) strength. The results show that the dielectric spectra and I-V curves of nanofluid-based iron oxide increases with the increase of iron oxide nanoparticle loading, while for titanium dioxide, it exhibits a decreasing response. The dielectric BD strength is enhanced for both types of nanoparticles at 0.01 g/L concentration. However, the increasing amount of nanoparticles at 0.1 and 1.0 g/L led to a contrary dielectric BD response. Thus, the results indicate that the augmentation of conductive nanoparticles in the suspension can lead to overlapping mechanisms. Consequently, this reduces the BD strength compared to pristine materials during electron injection in high electric fields.

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Section: Introductionmentioning

confidence: 99%

Influence of Conductive and Semi-Conductive Nanoparticles on the Dielectric Response of Natural Ester-Based Nanofluid Insulation

et al. 2018

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“…Thus, the hot spot temperature should be known to estimate the life of the power transformer. The aging rate of thermally upgraded Kraft paper in natural ester fluid was significantly slower compared with that in mineral oil [2]. This lifespan increase of insulating paper in natural ester fluid occurs because the water absorption capability of natural ester fluid (1,050 mg/kg at 25 °C) is higher than that of mineral oil (60 mg/kg at 25 °C).…”

Section: Introductionmentioning

confidence: 93%

Winding Temperature Measurement in a 154 kV Transformer Filled with Natural Ester Fluid

Kweon¹,

Koo²

2013

Journal of Electrical Engineering and Technology

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-This paper measures the hot spot temperatures in a single-phase, 154 kV, 15/20 MVA power transformer filled with natural ester fluid using optical fiber sensors and compares them with those calculated by conventional heat run tests. A total of 14 optical fiber sensors were installed on the high-voltage and low-voltage windings to measure the hot spot temperatures. In addition, three thermocouples were installed in the transformer to measure the temperature distribution during the heat run tests. In the low-voltage winding, the hot spot temperature was 108.4 °C, calculated by the conventional heat run test. However, the hot spot temperature measured using the optical fiber sensor was 129.4 °C between turns 2 and 3 on the upper side of the low-voltage winding. Therefore, the hot spot temperature of the low-voltage winding measured using the optical fiber sensor was 21.0 °C higher than that calculated by the conventional heat run test.

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“…Since its development, vegetable dielectric oils have been characterized by various physical and chemical tests to determine a direct relationship between their properties and performance [12]. In Fig.…”

Section: B Propertiesmentioning

confidence: 99%

Power distribution transformers using natural ester fluids as dielectric and coolant

et al. 2016

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Abstract− Researches related with the use of Natural Ester Fluids as refrigerant of power transformers has been developed in other countries with successful results. In Colombia there is no a procedure to control the use of these esters in electrical apparatus, so the current implementations are regulated by NTC 1465 standards for mineral esters. This new proposal involves the composition and the most relevant properties (the ignition resistance, impact on the lifetime of the insulating papers and the impact on the environment), which makes the application of natural esters fluids advantageous not only to preserve the environment but also to get a better performance of power transformers.Keywords− Natural Ester Fluid, distribution transformers, electrical apparatus, environment, chemical properties.Resumen− Las investigaciones en desarrollo respecto al uso de aceites de origen vegetal como refrigerantes en transformadores de distribución han tenido resultados destacados en otros países. En Colombia no existe un procedimiento para monitorear la aplicación de estos aceites en equipos eléctricos, por lo tanto la actual implementación se regula por la norma técnica NTC 1465 para aceites de origen mineral. Esta propuesta de nueva tecnología contempla la composición y las propiedades más relevantes (resistencia a la ignición, impacto en el tiempo de vida del papel e impacto en el medio ambiente), lo cual provee de mayor número de ventajas al aceite vegetal y un mejor desempeño en eficiencia. Palabras clave−

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Natural Ester Dielectric Fluid Development

Cited by 54 publications

References 3 publications

Influence of Conductive and Semi-Conductive Nanoparticles on the Dielectric Response of Natural Ester-Based Nanofluid Insulation

Influence of Conductive and Semi-Conductive Nanoparticles on the Dielectric Response of Natural Ester-Based Nanofluid Insulation

Winding Temperature Measurement in a 154 kV Transformer Filled with Natural Ester Fluid

Power distribution transformers using natural ester fluids as dielectric and coolant

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