Indirect detection of DP for insulating paper based on methanol content in transformer oil by spectroscopic approach

Lei, Peng; Fu, Qiang; Li, Li; Lin, Musong

doi:10.1109/tdei.2018.007609

Cited by 20 publications

(10 citation statements)

References 13 publications

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“…Kraft paper, which is mainly composed of lignocellulose, has been widely used in power transformers since 70 years owing to its low cost, renewability, and relatively good insulating performance. [1,2] Kraft paper is commonly applied in transformers in combination with insulating oil because paper is a porous material with numerous air voids that will decrease the breakdown strength of the paper dramatically. The internal insulation strength of transformers proves to be the main factor that limits their capacity and voltage level.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Cellulose Insulating Paper with Low Dielectric Constant by BTCA Esterification Crosslinking

Yang

Hou

et al. 2020

Macro Materials & Eng

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This study aims to decrease the dielectric constant of kraft paper by 1,2,3,4‐butanetetracarboxylic acid (BTCA) esterification crosslinking. Kraft paper samples are treated with various concentrations of BTCA to prepare modified paper with different reaction degrees. Morphology and surface chemical composition are characterized. The dielectric constant and loss of the plain and modified paper are also investigated. Results show that esterification occurs successfully between cellulose molecular chain and BTCA. The intrinsic dielectric constant and loss of 6 g L−1 BTCA‐treated paper decrease by 23.5% and 36.3%, respectively, at 50 Hz. The esterification can reduce the hydroxyl amounts on cellulose. The formed crosslinking network between the cellulose chains restricts the cellulose orientation polarization, thereby reducing cellulose polarizability. The electrical strength, mechanical properties, and thermal behavior of the samples are explored to evaluate comprehensively the modifying effect. BTCA esterification crosslinking proves to be a promising method for decreasing the dielectric constant of kraft paper.

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Section: Introductionmentioning

confidence: 99%

Preparation of Cellulose Insulating Paper with Low Dielectric Constant by BTCA Esterification Crosslinking

Yang

Hou

et al. 2020

Macro Materials & Eng

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“…Estimations of the remaining life of a transformer have been studied by applying the history of diagnostic data for the transformer [9]. The methanol content in insulating oil has been measured by spectroscopic methods, and the aging of insulating paper has been evaluated [10]. In addition, the characteristic Raman spectrum of faulty gas dissolved in transformer oil has been studied [11].…”

Section: Introductionmentioning

confidence: 99%

Novel Method for Estimating Furfural Content in Transformer Insulating Oil Using Spectroscopic Analysis and Pattern Recognition

Oshima

Suehara

Hashimoto

et al. 2022

IEEJ Transactions Elec Engng

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The transformer is the most essential component in electrical power transmission. Once a transformer is installed, it is generally used for decades. When failure occurs in a transformer, serious problems can arise, and numerous electrical components that depend on the transformer may be affected. Thus, deterioration diagnosis of transformers is important. The furfural content in the insulating oil of a transformer is widely used as an indicator of transformer deterioration, as furfural is generated by decomposition of the insulating paper. Although the degree of transformer deterioration can be estimated by measuring the furfural content, this measurement is time-consuming. This paper proposes a novel method for estimating the amount of furfural contained in insulating oil within a short time. The method is realized by combining spectroscopic analysis in the visible region with a pattern recognition technique. The effectiveness of the proposed method is verified through a series of experiments.

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“…Cellulosic insulating paper, together with mineral insulating oil, has been applied as the main insulation in transformers for nearly 80 years owing to its low cost, renewability, and relatively good insulating performance. [1,2] The oil-paper insulation has been proved to be the critical factor that determines the capacity and voltage level of the transformers. [3,4] The pressboard, oil dust, and paper barriers together constitute the main internal insulation of the transformer.…”

Section: Introductionmentioning

confidence: 99%

Development of PPTA/cellulose three‐layer composite insulating paper with low dielectric constant and good mechanical strength based on molecular dynamics simulation

Yang

Yin

et al. 2022

Polymer Composites

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Reducing the dielectric constant of insulating paper to improve the dielectric coordination performance of the oil‐paper systems has always been the research hotspot in the transformer insulation material industry. This paper prepares a novel poly‐p‐phenylene terephthalamide (PPTA)/cellulose composite paper with low dielectric constant and good mechanical properties. Various PPTA/cellulose mixing structures were established and the dielectric and mechanical properties were simulated via molecular dynamics simulation. Results showed that the PPTA/cellulose composite system had a lower dielectric constant than the cellulose system, for adding PPTA molecular could reduce the free volume of the system and limit the steering polarization of the dipole, as well as decrease the system polarization intensity. Constructing a three‐layer structure that contains continuous cellulose middle layer could improve the mechanical properties of the composite system greatly. Experimental results verified the simulation results. The dielectric constant of the three‐layer PPTA/cellulose composite paper decreased from 3.98 to 3.49 at 50 Hz, compared to the conventional cellulose paper. Moreover, the tensile strength of the novel three‐layer PPTA/cellulose composite paper (thickness: 130 μm) has reached 9.02 kN/m, increased by 27.6% than the directly mixed composite paper. Molecular dynamics simulation proves to be a promising method for guiding paper modification. Constructing three‐layer PPTA/cellulose structure represents an effective way to prepare a low dielectric constant composite insulating paper with good mechanical properties.

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Indirect detection of DP for insulating paper based on methanol content in transformer oil by spectroscopic approach

Cited by 20 publications

References 13 publications

Preparation of Cellulose Insulating Paper with Low Dielectric Constant by BTCA Esterification Crosslinking

Preparation of Cellulose Insulating Paper with Low Dielectric Constant by BTCA Esterification Crosslinking

Novel Method for Estimating Furfural Content in Transformer Insulating Oil Using Spectroscopic Analysis and Pattern Recognition

Development of PPTA/cellulose three‐layer composite insulating paper with low dielectric constant and good mechanical strength based on molecular dynamics simulation

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