Quantitative study of electric conduction in mineral oil by time domain and frequency domain measurement

Zhou, Yuan; Hao, Miao; Wilson, Gordon; Jarman, Paul

doi:10.1109/tdei.2015.005062

Cited by 9 publications

(3 citation statements)

References 28 publications

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“…The mobility of charge carriers in pure liquid hydrocarbons, obtained in [35], remains constant within a wide range of electric field magnitudes. However, in [36] it was suggested that in mineral oils the charge carriers with both, lower and higher mobilities can be present. In the present work, the mobility of charge carriers was obtained using different electric field magnitudes.…”

Section: Discussionmentioning

confidence: 99%

Mobility of charge carriers in mineral oil and ester fluids

et al. 2021

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New, more stringent environmental requirements for electrical insulation liquids have led to the development of novel, more environment-friendly liquid dielectrics. Ester fluids, introduced several decades ago, provide a viable alternative to traditional mineral insulating liquids. In order to expand the practical applications of these novel dielectric fluids, their dielectric and electrical parameters should be established. One of the critical parameters that affects and governs the development of pre-breakdown processes in insulating liquids is the mobility of charge carriers. In the present paper, the mobility of charge carriers in commercially available synthetic and natural insulating ester fluids and in a mineral insulating oil were obtained using two methods, the time of flight and the space charge saturation current methods. The mobility was obtained for a wide range of electrical field magnitudes. It was found that the mobility of charge carriers is greater in the mineral oil than in both, the natural and synthetic, ester fluids. It was also established that the mobility is higher for higher applied electric field. The results of this work will help in characterizing liquid dielectrics and in optimizing high-voltage systems in which liquid dielectrics, including natural and synthetic ester fluids, are used.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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Section: Discussionmentioning

confidence: 99%

Mobility of charge carriers in mineral oil and ester fluids

et al. 2021

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“…Zhou and co-workers suggested to the characterize charge carriers in mineral insulating oil by using the polarization and depolarization currents, and simulate the frequency response by the calculated insulating oil conductivity [58,59].…”

Section: Electrical Conductivity Of Mineral Insulating Oilmentioning

confidence: 99%

Review of Research Progress on the Electrical Properties and Modification of Mineral Insulating Oils Used in Power Transformers

et al. 2018

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Abstract:In November 2017, the first ±1100 kV high-voltage direct-current power transformer in the world, which was made by Siemens in Nurnberg, passed its type test. Meanwhile, in early 2017, a ±1000 kV ultra-high voltage (UHV) substation was officially put into operation in Tianjin, China. These examples illustrate that the era of UHV power transmission is coming. With the rapid increase in power transmission voltage, the performance requirements for the insulation of power transformers are getting higher and higher. The traditional mineral oils used inside power transformers as insulating and cooling agents are thus facing a serious challenge to meet these requirements. In this review, the basic properties of traditional mineral insulating oil are first introduced. Then, the variation of electrical properties such as breakdown strength, permittivity, and conductivity during transformer operation and aging is summarized. Next, the modification of mineral insulating oil is investigated with a focus on the influence of nanoparticles on the electrical properties of nano-modified insulating oil. Recent studies on the performance of mineral oil at molecular and atomic levels by molecular dynamics simulations are then described. Finally, future research hotspots and notable research topics are discussed.

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“…Condition monitoring of transformers helps determine the maintenance and replacement decisions of transformers [1]. The insulating oil in transformers plays the roles of coolant and insulation [2]. DC resistivity of the oil is one of key parameters to assess the transformer insulation condition, based on the fact that the DC resistivity is sensitive to the oil degradation [3].…”

Section: Introductionmentioning

confidence: 99%