Dielectric analysis of vegetable and mineral oils

Ulrych, Jiri; Svoboda, Michal; Polanský, Radek; Pihera, Josef

doi:10.1109/icdl.2014.6893085

Cited by 15 publications

(11 citation statements)

References 15 publications

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“…The characteristics of the frequency response of insulating oils shown in this paper have been widely observed by other researchers [13][14][15][16][17][18]. Although the mineral oils tested here have gone through different types of stresses and their original conditions may be different slightly from each other, the frequency responses of these three mineral oils can give an overall picture of the effect of oil conditions when they are fresh, in service for several years and heavily aged that needs to be replaced.…”

Section: Comparation Of the Modified Space Charge Polarization Model supporting

confidence: 65%

“…As the dissociation coefficient of mineral oil increases with temperature, more charge carriers will be generated through ionic dissociation, resulting in a high conductivity if the temperature rises. As reported by other researchers, the relative permittivity of insulting oil changes slightly with the temperature [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. The viscosity of mineral oil decreases with temperature.…”

Section: Coelho's Space Charge Polarization Theorymentioning

confidence: 81%

“…Various diagnostic methods have been applied to monitor dielectric changes in insulating liquid over time, no matter these changes are due to thermal, electrical or chemical effects [1][2][3][4]. Dielectric spectroscopy technique, which enables us to gain a bunch of information about the dynamics of bound and mobile charge carriers, has been widely employed in the evaluation of insulating properties of dielectric liquids [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Study of the charge dynamics in mineral oil under a non-homogeneous field

Zhou

Hao

Wilson

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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The presence of mobile charge carriers can affect the frequency response of complex permittivity of insulating liquid when the frequency is low. It has been found that the experimental results of the complex permittivity of mineral oils are in a good agreement with Coelho's frequency response theory when an extra contribution to the complex permittivity arising from DC conduction is taken into account. It has been reported that small quantity of high mobility charge carriers are responsible for this DC conduction. In our previous work, we have found that if the charge carriers are fast enough so that they can reach the opposite electrode in a cycle, the motion of these fast charge carriers can only contribute to the imaginary part of the complex permittivity under a homogeneous field. In this paper, the polarization induced by the motion of those fast charge carriers under a non-homogeneous field has been studied. It has been found when the field is not high, the total current caused by the drift and diffusion of those fast charge carriers is proportional to the external voltage. A modified space charge polarization theory has been proposed. The frequency dependence of the complex permittivity obtained experimentally has been fitted using this modified Coelho model and compared with our previous simulation. This modified model enables one to gain a better understanding of the frequency response in mineral oil in low frequency regions.

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Section: Comparation Of the Modified Space Charge Polarization Model supporting

confidence: 65%

Section: Coelho's Space Charge Polarization Theorymentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

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Study of the charge dynamics in mineral oil under a non-homogeneous field

Zhou

Hao

Wilson

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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“…The major technical areas (with respect to the use of vegetable oils as insulation liquid in transformers), which need further attention is listed as following [5,[42][43][44][45][66][67][68][69][70][71][72][73][74][75][76][77][78][79][80][81][82][83][84][85]: (i) More studies and research is needed to the reduce the production cost, develop low cost feed stocks and identify potential markets in order to balance cost and availability. (ii) Continued transformer performance and durability in a variety of transformer types and sizes need to be developed to increase manufacture and consumer confidence.…”

Section: Technical Difficultiesmentioning

confidence: 99%

Use of vegetable oils as transformer oils – a review

Rafiq

Zhou

et al. 2015

Renewable and Sustainable Energy Reviews

254

102

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“…Besides the coconut oil, sunflower and rapeseed have excellent fire resistance and biodegradability properties. 14 Comparison of typical values 34 of different insulating properties has been given in Table 6. A large number of research works have been done by the researchers across the globe to find out an environment-friendly substitute of transformer mineral oil.…”

Section: Properties Of Alternative Transformer Insulating Liquidmentioning

confidence: 99%

Electrical insulating liquid: A review

Mahanta¹,

Laskar

2017

J. Adv. Dielect.

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Insulating liquid plays an important role for the life span of the transformer. Petroleum-based mineral oil has become dominant insulating liquid of transformer for more than a century for its excellent dielectric and cooling properties. However, the usage of petroleum-based mineral oil, derived from a nonrenewable energy source, has affected the environment for its nonbiodegradability property. Therefore, researchers direct their attention to renewable and biodegradable alternatives. Palm fatty acid ester, coconut oil, sunflower oil, etc. are considered as alternatives to replace mineral oil as transformer insulation liquid. This paper gives an extensive review of different liquid insulating materials used in a transformer. Characterization of different liquids as an insulating material has been discussed. An attempt has been made to classify different insulating liquids-based on different properties.

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Dielectric analysis of vegetable and mineral oils

Cited by 15 publications

References 15 publications

Study of the charge dynamics in mineral oil under a non-homogeneous field

Study of the charge dynamics in mineral oil under a non-homogeneous field

Use of vegetable oils as transformer oils – a review

Electrical insulating liquid: A review

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