Thermal Performance of Ester Oil Transformers with Different Placement of Cooling Fan

Velandy, Jeyabalan; Garg, Ankita; Narasimhan, C. S.

doi:10.1109/piicon49524.2020.9112958

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…The higher the transformer operating temperature and humidity, the shorter the lifetime of the transformer insulation system. The analysis of cooling conditioning properties in various insulating liquids used in the transformer, together with the factors affecting them, has already been presented in the literature [41][42][43]. However, no information is available on the effects of various factors, including temperature and humidity, on the cooling efficiency of the paper insulation used in the transformer.…”

Section: Introductionmentioning

confidence: 99%

Effect of Moisture on the Thermal Conductivity of Cellulose and Aramid Paper Impregnated with Various Dielectric Liquids

et al. 2020

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This paper presents the effect of the impact of moisture in paper insulation used as insulation of transformer windings on its thermal conductivity. Various types of paper (cellulose and aramid) and impregnated (mineral oil, synthetic ester, and natural ester) were tested. The impact of paper and impregnated types on the changes in thermal conductivity of paper insulation caused by an increase in moisture were analyzed. A linear equation, describing the changes in thermal conductivity due to moisture, for various types of paper and impregnated, was developed. The results of measuring the thermal conductivity of paper insulation depending on the temperature are presented. The aim of the study is to develop an experimental database to better understand the heat transport inside transformers to assess aging and optimize their performance.

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Section: Introductionmentioning

confidence: 99%

Effect of Moisture on the Thermal Conductivity of Cellulose and Aramid Paper Impregnated with Various Dielectric Liquids

et al. 2020

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“…This evoked a further study by the same authors on varying structural placement of cooling fans to transformers. When predicting the hotspots and winding temperature in the transformer using Thermal-Hydraulic network model, three horizontal fans or five vertical fans provide 100% cooling/heat evacuation for natural ester oil filled transformer hence a structural modification to power transformers is recommended [55].…”

Section: Viscositymentioning

confidence: 99%

Alternative liquid dielectrics in power transformer insulation: a review

Tlhabologo

Samikannu

Mosalaosi

2021

IJEECS

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Transformer liquid dielectrics evolved where mineral oil has been the dominant choice until emergence of synthetic esters and natural esters. Natural ester-based oils have been under extensive investigations to enhance their properties for replacing petroleum-based mineral oil, which is non-biodegradable and has poor dielectric properties. This paper focuses on exposition of natural ester oil application in mixed transformer liquid dielectrics. Physical, chemical, electrical, and ageing characteristics of these dielectrics and the dissolved gas analysis (DGA) were reviewed. Physical properties include viscosity, pour point, flash and fire point which are vital indicators of heat insulation and fire risk. Chemical properties considered are water content, acid number, DGA, corrosive sulphur, and sludge content to limit and detect degradation and corrosion due to oil ageing. Electrical properties including breakdown voltage were considered for consistent insulation during overload and fault conditions. These properties of evolving alternative dielectrics were reviewed based on ASTM International standards and International Electro technical Commission standards for acceptable transformer liquid dielectrics. This review paper was compiled to avail modern methodologies for both the industry and scholars, also providing the significance of using mixed dielectrics for power transformers as they are concluded to show superiority over non-mixed dielectrics.

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“…Besides the biodegradability, natural ester exhibits additional advantages over mineral oil, such as fire safety, aging rate reduction of cellulose insulation and moisture tolerance [1], [2]. From the utilities perspective, the change in the mineral oil paradigm can be approached by i) replacing their assets by new eco-friendly transformers or ii) refurbishing their assets, substituting only the insulating fluid [3]. To make an informed decision, guidelines indicating how a transformer designed for mineral oil would behave when operating with natural ester as insulation fluid, are of major importance [2].…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Thermal Performance of Mineral Oil and Natural Ester for Safer Eco-Friendly Power Transformers

Couto¹,

Eléctricos²,

Ferreira³

et al. 2024

RE&PQJ

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At present, most of the worldwide transformer fleet uses mineral oil as insulation fluid. However, the use of natural ester is playing an increasing role as safer and eco-friendly alternative to mineral oil. From the utilities’ perspective, the change in the mineral oil paradigm can be approached by replacing their assets by new eco-friendly transformers or refurbishing their assets, substituting only the insulating fluid. To make an informed decision, guidelines indicating how a transformer designed for mineral oil would behave when operating with natural ester, are of paramount importance. In the present research, temperature rise tests were carried out in a 15MVA ODAF core-type power transformer, under different operating conditions. Tests were run for mineral oil as insulating fluid and subsequently repeated for natural ester. To gain further insights on experimental results, thermal modelling of the transformer under the same test conditions was carried out, using Thermal-Hydraulic Network Models and Computational Fluid Dynamics techniques. From the present work it was found that the relationship between the thermal behaviour of the transformer using natural ester or mineral oil is not simple as it depends on the operating conditions of the transformer and on the geometry of the windings.

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Thermal Performance of Ester Oil Transformers with Different Placement of Cooling Fan

Cited by 3 publications

References 12 publications

Effect of Moisture on the Thermal Conductivity of Cellulose and Aramid Paper Impregnated with Various Dielectric Liquids

Effect of Moisture on the Thermal Conductivity of Cellulose and Aramid Paper Impregnated with Various Dielectric Liquids

Alternative liquid dielectrics in power transformer insulation: a review

Comparison of the Thermal Performance of Mineral Oil and Natural Ester for Safer Eco-Friendly Power Transformers

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