Consideration on the Relationship Between Dielectric Breakdown Voltage and Water Content in Fatty Acid Esters

Suzuki, Takashi; Oba, R.; Kanetani, Akinori; Kano, Tadashige; Tamura, Takamitsu; Kato, Masako; Watanabe, Shizuka; Kasahara, Yuji; Iwahashi, Makio

doi:10.1007/s11746-012-2013-2

Cited by 23 publications

(10 citation statements)

References 15 publications

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“…On the other hand, moisture, small acid molecules, and gases like CO and CO2 generated during thermal aging of the insulating paper will enter the mineral insulating oil [37][38][39][40]. The structures of water, gas, and acid dissolved in the oil are shown in Figure The thermal aging rate of mineral oil-paper insulation with different temperatures and moisture contents has been studied [25].…”

Section: Breakdown Voltage 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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Section: Breakdown Voltage 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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“…The branching of the TMP esters has increased its concentration thus improving its capacity to saturate more moisture compared to the NPG esters. This is why despite a high content of moisture, TMP esters can withstand higher electrical breakdown (Kasahara et al, ).…”

Section: Resultsmentioning

confidence: 99%

Effects of Molecular Structure on the Physical, Chemical, and Electrical Properties of Ester‐Based Transformer Insulating Liquids

Raof

Yunus

Rashid

et al. 2019

J Americ Oil Chem Soc

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This article presents the experimental studies carried out on the environmental friendly polyol ester insulating liquids to investigate the effect of molecular structure on the physical, chemical, and electrical properties. Six different polyol esters that can be produced from the transesterification of various methyl esters with neopentylglycol/trimethylolpropane alcohols were synthesized and compared with those of refined, bleached, and deodorized palm oil (RBDPO) and mineral transformer oil. The finding suggests that the physical properties like fire point, pour point, and viscosity are very much affected by the molecular weight and molecular composition of the polyol esters. The electrical properties are also highly influenced by the molecular structure-related characteristics, such as the polarity, dipole polarization, carbon chain length, and degree of branching. The results confirm the findings of previous studies that the polyol esters and RBDPO have more polarity and dipole polarization compared to mineral oil. The experimental evidence showed that the newly synthesized insulating liquids have favorable thermal and electrical properties, thus suggesting that the insulating liquids have the potential to replace conventional insulating liquids to provide a more sustainable power system in the future.

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“…Far below saturation level, under dry condition, water molecules present in the form of being bonded to carbonyl group and etheric oxygen atoms of ester molecules, or are trapped between two ester molecules [14]. At this level, the presence of water does not give a significant effect on dielectric behavior of ester oils [9].…”

Section: Discussionmentioning

confidence: 99%

PD Behaviors of Monoester Insulating Oil under Different Moisture Contents

et al. 2018

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Consideration on the Relationship Between Dielectric Breakdown Voltage and Water Content in Fatty Acid Esters

Cited by 23 publications

References 15 publications

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

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

Effects of Molecular Structure on the Physical, Chemical, and Electrical Properties of Ester‐Based Transformer Insulating Liquids

PD Behaviors of Monoester Insulating Oil under Different Moisture Contents

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