Effect of composition and Morphology on the dielectric response of cellulose-based electrical insulation

Hollertz, Rebecca; Wågberg, Lars; Pitois, Claire

doi:10.1109/tdei.2015.005017

Cited by 16 publications

(16 citation statements)

References 25 publications

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“…Obtained presspaper samples in this study had a thickness of about 400 µm. Densities of the reference presspaper and presspaper modified by 10 wt % NFC were 0.95 g/cm 3 and 0.99 g/cm 3 , respectively. The measurements were conducted according to the IEC standard 60641-2.…”

Section: Preparation Of Samplesmentioning

confidence: 98%

“…Before further discuss the reason for the improvement, density is firstly taken into account. Density of reference presspaper is 0.95 g/cm 3 . That of presspaper containing 10 wt % NFC is 0.99 g/cm 3 .…”

Section: Mechanical Strengthmentioning

confidence: 99%

“…Density of reference presspaper is 0.95 g/cm 3 . That of presspaper containing 10 wt % NFC is 0.99 g/cm 3 . Specific strength, namely the strength-to-weight ratio, of unmodified presspaper is 115 MPa·g −1 ·cm 3 , that of presspaper modified by 10 wt % NFC is 137 MPa·g −1 ·cm 3 .…”

Section: Mechanical Strengthmentioning

confidence: 99%

“…Cellulose presspaper and pressboard, together with mineral oil, have been widely used in power transformers for many years due to their low cost and good insulating performances [1][2][3]. With the construction of ultra-high voltage direct current (UHVDC) power transmission, insulation failures in convert transformer have become a severe problem [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Enhancing Insulating Performances of Presspaper by Introduction of Nanofibrillated Cellulose

et al. 2017

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This study explores the possibility of enhancing both mechanical and breakdown properties of insulating presspaper by the introduction of an organic nano additive. Four different concentrations of nanofibrillated cellulose (NFC) were taken into account: 0.5 wt %, 2.5 wt %, 5 wt %, and 10 wt %. Presspaper containing no NFC was also prepared as a reference. Obtained samples were characterized by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). Mechanical properties and breakdown behaviors were measured. Results show that the addition of 10 wt % NFC to softwood fibers can achieve the best performance. Tensile strength of reference presspaper is 109 MPa, whereas that of presspaper modified by 10 wt % NFC is 136 MPa, resulting in a 25% increase. The improved tensile strength can be attributed to the increased density and inter fiber bond strength. More importantly, presspaper reinforced by 10 wt % NFC can also achieve enhanced AC and DC breakdown strengths, which are 19% and 21% higher than those of the reference presspaper. It is concluded that NFC is likely to be a promising nano additive for cellulose insulation.

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Section: Preparation Of Samplesmentioning

confidence: 98%

Section: Mechanical Strengthmentioning

confidence: 99%

Section: Mechanical Strengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhancing Insulating Performances of Presspaper by Introduction of Nanofibrillated Cellulose

et al. 2017

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“…In addition, permittivity differences in composites can lead to the build-up of strong localized electric fields, something that is believed to promote discharges and streamers. Around 50 Hz the permittivity of mineral oil is between 2.2-2.3, the permittivity of paper is around 5 and oil-impregnated paper hence has a permittivity between that of oil and paper (2.2-5) depending on the paper/oil volume fraction [1]. The response of different basic elements to an alternating electric field is given by their polarizability.…”

Section: Polarizations Of Wood Fibre Componentsmentioning

confidence: 99%

Kraft-Pulp Based Material for Electrical Insulation

Hollertz¹,

Wågberg²,

Pitois

2017

NORD-IS

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The dielectric properties of the electrical insulation material have a significant influence on the performance and reliability of components in electrical equipment. The influence of the chemistry and electronic structure of the different constituents of the kraft pulp (used in electrical insulation) on some dielectric properties is discussed in this paper. The studies and mechanisms discussed indicate that the presence of different wood polymers (cellulose, hemicellulose and lignin), have different effects on dielectric properties (static electrification and high frequency response). Our results show that the dielectric response of lignin is different compared with the response of hemicellulose and cellulose and this is also expected from the chemical structure of the different components. The lignin molecule has a higher polarizability at frequencies of significance for streamer inception and propagation. With spectroscopic ellipsometry measurements it has also been shown that the energy for electronic transitions in this spectral region is lower for lignin. The results also clearly indicate that the role of cellulose, lignin and hemicellulose should be further investigated for improving electrical breakdown strength of paper based insulation materials.

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Pore-regulation in 2D biochar-based flakes towards wideband microwave absorption

Yan

Lou

et al. 2023

Chemical Engineering Journal

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Effect of composition and Morphology on the dielectric response of cellulose-based electrical insulation

Cited by 16 publications

References 25 publications

Enhancing Insulating Performances of Presspaper by Introduction of Nanofibrillated Cellulose

Enhancing Insulating Performances of Presspaper by Introduction of Nanofibrillated Cellulose

Kraft-Pulp Based Material for Electrical Insulation

Pore-regulation in 2D biochar-based flakes towards wideband microwave absorption

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