Assessment of interfacial charge accumulation in oil-paper interface in transformer insulation from polarization-depolarization current measurements

Mishra, D.; Haque, Nasirul; Baral, Arijit; Chakravorti, S.

doi:10.1109/tdei.2017.006525

Cited by 56 publications

(56 citation statements)

References 31 publications

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“…During long‐term running, the insulating oil can readily initiate discharge and become the insulation weakness in the transformer. [ 6,7 ] Reducing the dielectric constant of the kraft paper can lead to uniform electric field distribution in the transformer structure and strengthened insulating performance. [ 8,9 ]…”

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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“…The profile of C ( t ) is also equally important as it is directly influenced by the charge content Q ( t ) of the insulation. As a result, it may get influenced by charge de‐trapping [22] observed in the polarisation–depolarisation current (PDC). In future, the profile of C ( t ) will be investigated in order to obtain information relevant to insulation ageing.…”

Section: Parameterisation Of Tvmmentioning

confidence: 99%

Time‐varying model for the effective diagnosis of oil‐paper insulation used in power transformers

Banerjee

Dutta

Baral

et al. 2019

IET Generation, Transmission & Distribution

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“…Macroscopic parameters (conductivity, dielectric constant, and loss factor) and microscopic parameters (polarizability, space charge) can be obtained by polarization and depolarization currents, and the corresponding internal microstructures can be inferred. It is an effective means to understand the physics essence of insulating dielectrics [1][2][3][4][5][6][7][8]. In recent years, most scholars have applied polarization and depolarization current to the diagnosis of insulation aging state.…”

Section: Introductionmentioning

confidence: 99%

Application of L1 Trend Filtering Technology on the Current Time Domain Spectroscopy of Dielectrics

Suo

Sun

et al. 2019

Electronics

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The current time domain spectroscopy of dielectrics provides important information for the analysis of dielectric properties and mechanisms. However, there is always interference during the testing process, which seriously affects the analysis of the test results. Therefore, the effective filtering of current time domain spectroscopy is particularly necessary. L1 trend filtering can estimate the trend items exactly in a set of time series. It has been widely used in the fields of economics and sociology. Therefore, this paper attempts to apply L1 trend filtering to the current time domain spectroscopy. Firstly, polarization and depolarization currents are measured in the laboratory. Then the test results are filtered by L1 trend filtering and the filtering effects are compared with several common filtering algorithms, such as a sliding mean filter and Savitzky–Golay smoothing filter. Finally, the robustness and time complexity of L1 trend filtering are analyzed. The filtering results show that because the polarization currents vary in a wide range of the time domain (about 2–3 orders of magnitude), smooth and undistorted curves in the whole test time range can hardly be obtained through common filtering algorithms, while they can be obtained by L1 trend filtering. The results of robustness analysis and time complexity analysis show that L1 trend filtering can extract the trend items accurately in the time series under given different noise levels, and the execution time is also lower than 176.67 s when the number of tested points is no more than 20,000. Those results show that L1 trend filtering can be applied to the time domain current spectroscopy of dielectrics.

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Assessment of interfacial charge accumulation in oil-paper interface in transformer insulation from polarization-depolarization current measurements

Cited by 56 publications

References 31 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

Time‐varying model for the effective diagnosis of oil‐paper insulation used in power transformers

Application of L1 Trend Filtering Technology on the Current Time Domain Spectroscopy of Dielectrics

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