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View article: Comparative Thermal Ageing Analysis of Ester Dielectric Fluids Impregnating TUK Paper: Implications for Transformer Maintenance Standards
Comparative Thermal Ageing Analysis of Ester Dielectric Fluids Impregnating TUK Paper: Implications for Transformer Maintenance Standards Open
The increasing demand for electricity and the requirement for transformers to operate under higher loads have driven the search for new insulating materials. On the one hand, papers with enhanced thermal resistance, such as thermally upgra…
View article: Kinetic Assessment of Kraft and Thermally Upgraded Kraft Papers Aged in Five Alternative Dielectric Fluids
Kinetic Assessment of Kraft and Thermally Upgraded Kraft Papers Aged in Five Alternative Dielectric Fluids Open
The lifespan of an electrical transformer, primarily determined by the condition of its solid insulation, is well known under various operating conditions when mineral oil is the coolant in these machines. However, there is a trend toward …
View article: Analysing the Suitability of Using Different Biodegradable Fluids for Power Transformers with Thermally Upgraded Paper
Analysing the Suitability of Using Different Biodegradable Fluids for Power Transformers with Thermally Upgraded Paper Open
Mineral oil has been used for many years in various electrical equipment, including transformers, as a cooling and insulation medium. However, its low biodegradability and poor performance in terms of fire protection have prompted the sear…
View article: Corrigendum to “Experimental dataset on the compressive mechanical properties of high-density pressboard used in power transformers spacers” [Data in Brief 50 (2023) 109471]
Corrigendum to “Experimental dataset on the compressive mechanical properties of high-density pressboard used in power transformers spacers” [Data in Brief 50 (2023) 109471] Open
[This corrects the article DOI: 10.1016/j.dib.2023.109471.].
View article: Experimental dataset on the compressive mechanical properties of high-density pressboard used in power transformers spacers
Experimental dataset on the compressive mechanical properties of high-density pressboard used in power transformers spacers Open
The structural elements within power transformers are commonly constructed from high-density pressboard, chosen for its favourable mechanical and dielectric properties. Among these elements are the spacers employed in the windings of trans…
View article: The Impact of Thermal Ageing on the Compression Strength of Radial Spacers in Power Transformers
The Impact of Thermal Ageing on the Compression Strength of Radial Spacers in Power Transformers Open
Radial spacers made of high-density pressboard play a critical role in power transformers, providing support and maintaining distance between winding disks for efficient dielectric oil flow through cooling ducts. However, prolonged exposur…
View article: Decarbonizing the Spanish transportation sector by 2050: Design and techno-economic assessment of the hydrogen generation and supply chain
Decarbonizing the Spanish transportation sector by 2050: Design and techno-economic assessment of the hydrogen generation and supply chain Open
The transport sector is difficult to decarbonize due to its high reliance on fossil fuels, accounting for 37% of global end-use sectors emissions in 2021. Therefore, this work proposes an energy model to replace the Spanish vehicle fleet b…
View article: Degradation of the compression strength of spacers made of high-density pressboard used in power transformers under the influence of thermal ageing
Degradation of the compression strength of spacers made of high-density pressboard used in power transformers under the influence of thermal ageing Open
The structural components inside power transformers are commonly made of high-density pressboard, due to its suitable mechanical and dielectric properties. Among these components are the spacers used in the windings of transformers, which …
View article: A Brief Review of the Impregnation Process with Dielectric Fluids of Cellulosic Materials Used in Electric Power Transformers
A Brief Review of the Impregnation Process with Dielectric Fluids of Cellulosic Materials Used in Electric Power Transformers Open
In the manufacturing of power transformers, the impregnation of the solid electric insulation systems (cellulosic materials) with a dielectric liquid is a key issue for increasing the breakdown voltage of the insulation, and this prevents …
View article: Implementation and digitalization of a renewable hydrogen-based power system for social housing decarbonization
Implementation and digitalization of a renewable hydrogen-based power system for social housing decarbonization Open
The mitigation of greenhouse gases (GHG) triggered by the broad employment of fossil fuels requires a complete energy transition towards the utilization of renewable energy sources (RES), the increase in the efficiency of the systems, impl…
View article: Understanding the Ageing Performance of Alternative Dielectric Fluids
Understanding the Ageing Performance of Alternative Dielectric Fluids Open
Mineral oil has traditionally been used as a cooling fluid in power transformers, but its low biodegradability and low fire point have motivated the search of alternatives. In this work, six different dielectric fluids have been studied, i…
View article: Study on the degradation of the compression strength of spacers made of high-density pressboard used in power transformers under the influence of thermal ageing
Study on the degradation of the compression strength of spacers made of high-density pressboard used in power transformers under the influence of thermal ageing Open
The structural components inside power transformers are commonly made of high-density pressboard, due to its suitable mechanical and dielectric properties. One of these essential components are the spacers used in the windings of transform…
View article: Mineral and Ester Nanofluids as Dielectric Cooling Liquid for Power Transformers
Mineral and Ester Nanofluids as Dielectric Cooling Liquid for Power Transformers Open
Amidst the new techniques facing the improvement of cooling and insulating efficiency and the design of electric transformers, constrained by the current technologies, one of the more promising is the substitution of traditional dielectric…
View article: A modification of the Norris failure criterion for the prediction of the mechanical failure of the aged paper insulation in the windings of a power transformer
A modification of the Norris failure criterion for the prediction of the mechanical failure of the aged paper insulation in the windings of a power transformer Open
The deterioration of the insulation in the windings of power transformers affects their lifespan. A commercial insulated Continuously Transposed Conductor (CTC) was studied experimentally, numerically and analytically. The purpose was to u…
View article: Investigation of the Degradation of a Wood Pulp-Cotton Presspaper in Different Biodegradable Oils
Investigation of the Degradation of a Wood Pulp-Cotton Presspaper in Different Biodegradable Oils Open
New insulating materials, as biodegradable oils and upgraded paper, need to be investigated. In this paper, the ageing of a wood pulp - cotton presspaper is studied. Solid insulation is impregnated and aged with three different fluids: a m…
View article: Effect of the Thermal Characteristics of Dielectric Fluids on the Loading Capacity of a Power Transformer
Effect of the Thermal Characteristics of Dielectric Fluids on the Loading Capacity of a Power Transformer Open
The use of biodegradable dielectric liquids in power transformers has several advantages, such as increased fire safety or their biodegradability in the event of a leak in the tank. However, they also have a higher viscosity that does not …
View article: CFD study of the impact of the deviation on the mass flow inlet on winding hot-spot temperature of a power transformer using mineral and ester oils
CFD study of the impact of the deviation on the mass flow inlet on winding hot-spot temperature of a power transformer using mineral and ester oils Open
This work presents a study where a deviation on the mass flow rate in adjacent sectors of the winding is considered. A CFD model was developed for this study, where heat transfer between sectors is enabled due to the lack of thermal symmet…
View article: Impact of the Use of Vegetable Oil on the Mechanical Failure of the Cellulosic Insulation of Continuously Transposed Conductors in Power Transformers
Impact of the Use of Vegetable Oil on the Mechanical Failure of the Cellulosic Insulation of Continuously Transposed Conductors in Power Transformers Open
Natural esters have become of interest for the industry in recent years as dielectric liquids for power transformers, and many studies are focused on their dielectric and chemical properties and on their influence in the degradation of the…
View article: Kinetic Assessment of Mechanical Properties of a Cellulose Board Aged in Mineral Oil and Synthetic Ester
Kinetic Assessment of Mechanical Properties of a Cellulose Board Aged in Mineral Oil and Synthetic Ester Open
In oil-immersed power transformers, the insulation system is constituted of a dielectric oil–solid combination. The insulation oil generally used is mineral oil; however, this fluid has started to be substituted by natural and synthetic es…
View article: Use Performance and Management of Biodegradable Fluids as Transformer Insulation
Use Performance and Management of Biodegradable Fluids as Transformer Insulation Open
In recent years, the use of biodegradable fluids as liquid insulation for distribution and power transformers is spreading. The main biodegradable fluids used are natural and synthetic esters, although biodegradable hydrocarbons have been …
View article: Fracture Toughness As An Alternative Approach To Quantify The Ageing of Insulation Paper In Oil
Fracture Toughness As An Alternative Approach To Quantify The Ageing of Insulation Paper In Oil Open
Oil-immersed transformers use paper and oil as insulation system which degrades slowly during the operation of these machines. The fast-developing electric power industry demands superior performance of electrical insulation materials whic…
View article: Dielectric and mechanical assessment of cellulosic insulation during transformer manufacturing
Dielectric and mechanical assessment of cellulosic insulation during transformer manufacturing Open
Due to the impact of cellulose of paper insulation on transformer life, it is imperatire to remove moisture from the oil and the solid insulation. Several techniques have been implemented during manufacturing of power transformers to reduc…
View article: Experimental dataset on the tensile and compressive mechanical properties of plain Kraft and crepe papers used as insulation in power transformers after ageing in mineral oil
Experimental dataset on the tensile and compressive mechanical properties of plain Kraft and crepe papers used as insulation in power transformers after ageing in mineral oil Open
The solid insulation in the windings of power transformers, which generally consists of oil-impregnated thin paper, is one of the key elements for the performance and durability of these electrical machines. Insulation paper is subjected t…
View article: Study of the Impregnation of Power-Transformer Cellulosic Materials With Dielectric Ester Oils
Study of the Impregnation of Power-Transformer Cellulosic Materials With Dielectric Ester Oils Open
The application of alternative dielectric oils as esters in power transformers is hindered by the lack of knowledge regarding their properties and respecting which are the best techniques to ensure their proper performance. In this sense o…
View article: Ageing of Crepe Paper in Mineral Oil and Natural Ester
Ageing of Crepe Paper in Mineral Oil and Natural Ester Open
Several billion liters of transformer oil are used in oil filled transformers worldwide. These machines are voltage transformation devices in which during their operation the heat of windings and iron core firstly is transferred to the ins…