Thermal properties of a mixture of mineral oil and synthetic ester in terms of its application in the transformer

Nadolny, Zbigniew; Dombek, Grzegorz; Przybyłek, Piotr

doi:10.1109/ceidp.2016.7785457

Cited by 31 publications

(22 citation statements)

References 8 publications

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“…Obtained results are consistent with other results of authors described in their papers [14][15][16][17]. In the papers, heat transfer coefficient α was calculated on the basis of measurements of five thermal properties of the liquid: thermal conductivity λ, specific heat cp, viscosity υ, density ρ, and thermal expansion coefficient β.…”

Section: ·Ksupporting

confidence: 87%

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Heat transfer coefficient as parameter describing ability of insulating liquid to heat transfer

2017

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Abstract. The paper presents the results of the measurements of heat transfer coefficient of insulating liquids used in transformers. The coefficient describes an ability of the liquid to heat transport. On the basis of the coefficient, effectiveness of cooling system of electric power devices can be estimated. Following liquids were used for the measurements: mineral oil, synthetic ester and natural ester. It was assumed that surface heat load is about 2500 W·m -2 , which is equal the load of transformer windings. A height of heat element was 1.6 m, because it makes possible steady distribution of temperature on its surface. The measurements of heat transfer coefficient was made as a function of various position of heat element (vertical, horizontal). In frame of horizontal position of heat element, three suppositions were analysed: top, bottom, and side.

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Section: ·Ksupporting

confidence: 87%

“…Following liquids were investigated: mineral oil (Nynas Draco), synthetic ester (Midel 7131) and natural ester (Envirotemp FR3). All material parameters of mentioned liquids are described in authors papers [1][2][3][14][15][16][17]. Vertical and horizontal positions of the heating element were analyzed.…”

Section: Aim and Range Of Investigationmentioning

confidence: 99%

Heat transfer coefficient as parameter describing ability of insulating liquid to heat transfer

2017

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“…For this reason, while designing the power supply systems built of such type of sources, the selection of their optimum configuration, which concerns the type and number of used sources and systems that store the energy and improve quality of the supplied energy is absolutely important [6][7][8][9][10][11]. On a global scale, what may also be the subject of optimisation is the location of the generation system and transmission lines [12][13][14][15][16][17][18]. It is also necessary to emphasise that in the process of solving technical problems, the more and more frequently decisive criteria include economic ratios.…”

Section: Introductionmentioning

confidence: 99%

Minimisation of the LCOE for the hybrid power supply system with the lead-acid battery

et al. 2017

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Abstract. The paper presents the methodology of minimisation of the unit cost of production of energy generated in the hybrid system compatible with the lead-acid battery, and used to power a load with the known daily load curve. For this purpose, the objective function in the form of the LCOE and the genetic algorithm method were used. Simulation tests for three types of load with set daily load characteristics were performed. By taking advantage of the legal regulations applicable in the territory of Poland, regarding the energy storing in the power system, the optimal structure of the prosumer solar-wind system including the lead-acid battery, which meets the condition of maximum rated power, was established. An assumption was made that the whole solar energy supplied to the load would be generated in the optimised system.

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“…The most important of these are: ultra-high frequency (UHF) [2,3], acoustic wave generation (AE) [4][5][6][7], optical radiation [8][9][10] and high-energy X-rays [11,12]. Based on these phenomena, measurement methods have been applied, which are used in diagnostics of insulation systems in power transformers [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Mathematical model of optical signals emitted by electrical discharges occuring in electroinsulating oil

Kozioł

2017

E3S Web Conf.

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Abstract. The article presents a parametric model describing the registered distributions spectrum of optical radiation emitted by electrical discharges generated in the systems: the needle-needle, the needleplate and in the system for surface discharges. Generation of electrical discharges and registration of the emitted radiation was carried out in three different electrical insulating oils: fabric new, operated (used) and operated with air bubbles. For registration of optical spectra in the range of ultraviolet, visible and near infrared a high resolution spectrophotometer was. The proposed mathematical model was developed in a regression procedure using gauss-sigmoid type function. The dependent variable was the intensity of the recorded optical signals. In order to estimate the optimal parameters of the model an evolutionary algorithm was used. The optimization procedure was performed in Matlab environment. For determination of the matching quality of theoretical parameters of the regression function to the empirical data determination coefficient R 2 was applied.

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Thermal properties of a mixture of mineral oil and synthetic ester in terms of its application in the transformer

Cited by 31 publications

References 8 publications

Heat transfer coefficient as parameter describing ability of insulating liquid to heat transfer

Heat transfer coefficient as parameter describing ability of insulating liquid to heat transfer

Minimisation of the LCOE for the hybrid power supply system with the lead-acid battery

Mathematical model of optical signals emitted by electrical discharges occuring in electroinsulating oil

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