Development of an efficient distribution transformer using amorphous core and vegetable insulating oil

Feil, Dion Lenon Prediger; Silva, P.R.; Bernardon, Daniel Pinheiro; Marchesan, Tiago Bandeira; Sperandio, Maurício; Medeiros, Leonardo H.

doi:10.1016/j.epsr.2016.12.015

Cited by 19 publications

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References 22 publications

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“…where "η" is the efficiency of converter as a function of percentage loading 'l', moreover, [34], (b) AC-DC converters [35], (c) DC-AC converters [36], and (d) AC-AC transformers [37].…”

Section: Overall System Model and Analysismentioning

confidence: 99%

“…For DC-DC converters, j = 8 and the corresponding values of k are: k 0 = 8.1, k 1 = −7.05, k 2 = −0.625, k 3 = −0.25, k 4 = −0.2, k 5 = −0.05, k 6 = 0.05, k 7 = 0, k 8 = −0.0125 For AC-DC converters, j = 9 and the corresponding values of k are: k 0 = 9.15, k 1 = −8,785, k 2 = −0.23, k 3 = −0.075, k 4 = −0.02, k 5 = −0.03, k 6 = 0, k 7 = 0, k 8 = −0.018, k 9 = −0.004 For DC-AC converters, j = 9 and the corresponding values of k are: k 0 = 7.52, k 1 = −6.74, k 2 = −0.48, k 3 = −0.1, k 4 = −0.09, k 5 = −0.07, k 6 = −0.06, k 7 = 0.05, k 8 = −0.01, k 9 = −0.01 For AC-AC transformers, j = 7 and the corresponding values of k are: k 0 = 9.47, k 1 = −9.24, k 2 = −0.15, k 3 = −0.06, k 4 = −0.01, k 5 = −0.01, k 6 = −0.01, k 7 = 0.005 Loading vs. efficiency curves of (a) DC-DC converters [34], (b) AC-DC converters [35], (c)DC-AC converters[36], and (d) AC-AC transformers[37]. " is the efficiency of converter as a function of percentage loading 'l', moreover, For DC-DC converters, j = 8 and the corresponding values of k are: k0 = 8.1, k1 = -7.05, k2 = -0.625, k3 = -0.25, k4 = -0.2, k5 = -0.05, k6 = 0.05, k7 =0, k8 = -0.0125…”

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confidence: 99%

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Efficiency Comparison of AC and DC Distribution Networks for Modern Residential Localities

et al. 2019

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The paper investigates the system efficiency for power distribution in residential localities considering daily load variations. Relevant system modeling is presented. A mathematical model is devised, which is based on the data from the Energy Information Administration (EIA), USA, for analysis. The results reveal that the DC distribution system can present an equivalent or even better efficiency compared to the AC distribution network with an efficiency advantage of 2.3%, averaged over a day. Furthermore, the distribution systems are compared under various capacities of solar PV accounting for the effect of variation in solar irradiation over time.

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“…where "η" is the efficiency of converter as a function of percentage loading 'l', moreover, [34], (b) AC-DC converters [35], (c) DC-AC converters [36], and (d) AC-AC transformers [37].…”

Section: Overall System Model and Analysismentioning

confidence: 99%

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confidence: 99%

Efficiency Comparison of AC and DC Distribution Networks for Modern Residential Localities

et al. 2019

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“…Figura 1: Circulação de óleo isolante pela parte ativa e pelo radiador do transformador Fonte: (SEG MAQS, 2020) A crescente busca por alternativas que diminuam o impacto no meio ambiente também se consolidou no setor elétrico (FEIL et al, 2017). Existem muitos estudos sendo feitos para a utilização do óleo vegetal isolante (OVI) em substituição ao óleo mineral isolante (OMI), a fim de se obter um fluido com a mesma finalidade do óleo mineral em transformadores de potência e que sejam biodegradáveis, menos inflamáveis e não tóxicos à saúde (WILHELM;TULIO;UHREN, 2009).…”

Section: Introductionunclassified

“…No entanto, devido à crise do mercado de petróleo nos anos 1970, surgiu um novo estímulo: buscar fontes biodegradáveis alternativas para aplicação em transformadores. Por volta do ano de 1999 foram desenvolvidos OVIs apropriados para a aplicação em transformadores de potência (FEIL et al, 2017;GUIMARÃES et al, 2019;STOCCO, 2010;WILHELM;TULIO;UHREN, 2009). A partir disso, diversas distribuidoras de energia elétrica brasileiras têm substituído transformadores a OMI por transformadores a OVI não só em suas redes de distribuição, mas também em subestações.…”

Section: Introductionunclassified

Análise De Desempenho Do Transformador De Potência Isolado a Óleo Vegetal Em Relação Ao Transformador De Potência Isolado a Óleo Mineral

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2020

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A utilização dos transformadores de potência é imprescindível para a continuidade de operação do sistema elétrico. Um dos componentes importantes do transformador é o óleo isolante, responsável por seu isolamento elétrico interno e sua refrigeração. Com a crescente preocupação ambiental, viu-se a necessidade de buscar novas alternativas para o sistema de isolamento dos transformadores, uma vez que o óleo mineral isolante é proveniente do petróleo, considerado tóxico, nocivo ao ambiente e de baixa biodegradabilidade. Pesquisas atuais mostraram que o óleo vegetal isolante é uma alternativa a ser considerada por empresas do setor elétrico, por ser um fluido biodegradável, com ponto de fulgor e combustão elevados, sendo caracterizado como um fluido com maior segurança. Este trabalho analisa as vantagens técnicas e operacionais da utilização do óleo vegetal isolante comparado com o óleo mineral isolante. São verificadas suas características físico-químicas, implicações ambientais em caso de derramamento, bem como implicações de segurança quanto ao ambiente de instalação. Conclui-se que o óleo vegetal apresenta vantagens na maioria dos aspectos operacionais e ambientais e também nos requisitos de instalação para segurança e confiabilidade operacionais.

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“…Amorphous alloys based on Fe and Co are characterised by promising soft magnetic properties (e.g., low coercive field value and high saturation magnetisation value) [5][6][7][8]. The absence of crystalline structure makes these materials extremely easy to re-magnetise, which results in their relatively low losses [9][10][11]. Therefore, they are used in components of low-loss transformer cores, amongst other applications [12,13].…”

Section: Introductionmentioning

confidence: 99%

The Magnetisation Process of Bulk Amorphous Alloys: Fe36+xCo36−xY8B20, Where: x = 0, 3, 7, or 12

et al. 2020

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Amorphous Fe- and Co-based alloys possess so-called soft magnetic properties. Due to the high sensitivity of the magnetisation vector to any inhomogeneities occurring in these alloys, it is possible to assess indirectly structural defects. This paper presents the results of research on the structure and magnetic properties of bulk amorphous alloys with a high content of Fe and Co. The magnetic properties of the produced alloys were tested using a Faraday magnetic balance and a vibrating sample magnetometer (VSM). Analysis of the magnetisation process in the region known as the approach to ferromagnetic saturation was carried out in accordance with Kronmüller’s theorem. Magnetisation in magnetic fields of greater than the effective anisotropy field (Holstein-Primakoff para-process) was also studied. For the studied alloys, it was found that an increase in Fe content causesan increase in saturation magnetisation, and decreases in the values of the coercive field and thespin-wave stiffness parameter, Dspf. A relationship was observed between the width of the amorphous halo and the value of the coercive field. However, no significant links were found between either the presence of structural defects and the properties of these materials, or between the Co content and the value of the coercive field.

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Development of an efficient distribution transformer using amorphous core and vegetable insulating oil

Cited by 19 publications

References 22 publications

Efficiency Comparison of AC and DC Distribution Networks for Modern Residential Localities

Efficiency Comparison of AC and DC Distribution Networks for Modern Residential Localities

Análise De Desempenho Do Transformador De Potência Isolado a Óleo Vegetal Em Relação Ao Transformador De Potência Isolado a Óleo Mineral

The Magnetisation Process of Bulk Amorphous Alloys: Fe36+xCo36−xY8B20, Where: x = 0, 3, 7, or 12

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