Surface charge accumulation and decay on directfluorinated oil-impregnated paper

Du, B. X.; Li, X. L.; Jiang, Jinpeng

doi:10.1109/tdei.2016.7736874

Cited by 20 publications

(14 citation statements)

References 24 publications

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“…During the corona charging, the carriers including electron, positive and negative ions would deposit on sample surface and would be captured by surface trap, followed by the thermal de-trapping just after the charging voltage was off. Since, the de-trapped time was shorter in shallow trap [4], the charges trapped in the shallow trap were more likely to dissipate in the initial stage during surface potential decay, and then the de-trapping of charges trapped in the deep trap would result in the deceleration of surface potential decay. Both the positive and negative surface potential decay rate of all the fluorinated samples were faster than the original samples, indicating that gas-phase fluorination had excellent suppression effect of surface charge accumulation in oil-impregnated Nomex paper.…”

Section: Surface Charge Accumulation and Dissipationmentioning

confidence: 99%

“…Nomex paper has been recognized as an excellent insulation material due to its good thermal stability, stable mechanical and electrical properties and has been widely used in dry-type, converter and oil immersed transformers among others, in which the reliability of the oil-paper insulation system greatly influences the safety of the power transmission system [1,2]. Previous researches indicate that the surface charge accumulated on the oil paper interface and the space charge accumulated in the oil impregnated paper may accelerate the degradation process of the oil paper insulation system, distort the electric field distribution and lead to insulation failures such as flashover and breakdown [3,4]. Therefore, a series of studies on the charge dynamic of the oil paper insulating system has been carried out and various approaches have been conducted to modify surface charge and space charge characteristics of the oil paper insulation system.…”

Section: Introductionmentioning

confidence: 99%

“…Wang et al [8] and Huang et al [9] studied the influence of thermal aging and voltage reversal on the space charge characteristic of oil-impregnated paper insulation, respectively. Moreover, Du et al [4,10] investigated the surface charge accumulation and dissipation of oil impregnated paper under DC and pulse voltage. However, the increasing voltage level of a power transmission system calls for higher reliability of insulation materials.…”

Section: Introductionmentioning

confidence: 99%

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Accelerated Charge Dissipation by Gas-Phase Fluorination on Nomex Paper

Wang

Khan

et al. 2019

Applied Sciences

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The surface charge and space charge accumulation in paper used in oil-paper insulation system may distort electric field distribution and lead to the flashover and breakdown of insulation system. In this paper, the effect of gas-phase fluorination on the surface charge and space charge characteristics of oil-impregnated Nomex paper was investigated. Nomex T410 was fluorinated at 25 • C using F 2 /N 2 mixtures with 20% F 2 in volume at 0.05 MPa for 15, 30 and 45 min. Fourier Transform Infrared Spectroscopy (FTIR) proved that the molecular chain scission and cleavage occurred during gas-phase fluorination. Furthermore, the surface charge and space charge characteristic of the original and fluorinated oil-impregnated paper were measured using an electrostatic voltmeter and Pulsed Electroacoustic (PEA) equipment respectively. Furthermore, the hole and electron trap distribution of the samples were obtained by Isothermal Surface Potential Decay (ISPD) model. The results showed that both the positive and negative charge decay rates were accelerated by gas-phase fluorination and the hole, electron trap energy and density of the fluorinated samples were reduced by fluorination. It is suggested that the space charge dissipation was also accelerated by fluorination, indicating that gas-phase fluorination is an effective approach to modify the charge dynamics of oil-impregnated Nomex paper.

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Section: Surface Charge Accumulation and Dissipationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Accelerated Charge Dissipation by Gas-Phase Fluorination on Nomex Paper

Wang

Khan

et al. 2019

Applied Sciences

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“…This shows that less positive charge than negative charge is accumulated on the surface, which infers that the detrapping process of the negative charge is more difficult than that of the positive charge [25].…”

Section: Now Takingmentioning

confidence: 87%

Investigating the Influence of Different Types of Nanoparticles on Thermal and Dielectric Properties of Insulation in Converter Transformer

Du¹

2017

Properties and Applications of Polymer Dielectrics

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Converter transformer is the extraordinarily vital apparatus in the high-voltage direct current (HVDC). Transformer oil and oil-impregnated paper are considered as the essential parts of converter transformer, which has suffered various complex electric fields such as AC/DC composite electric field and polarity reversal. The occurrence of discharge or insulation failure in oil-paper insulation system will threaten the safety of the entire grid. Hence, efforts should be focused on investigating the charge behavior and improving the property of dielectric.This chapter presents a study aimed at investigating the influence of different types of nanoparticles on thermal and dielectric properties along with the relation between them and the effects of switching overvoltage on the charge coupling behavior of oil-impregnated paper, and the surface charge behavior on double-layer oil-paper insulation under pulse voltage is investigated.

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“…in which ν e denotes the escaping frequency factor (distributed in the range of 10 12 ~ 10 14 Hz) of the charges captured by traps In this paper, the escape frequency factor is set to the representative value of 10 12 Hz according to recently reported experiments [23].…”

Section: Mathmentioning

confidence: 99%

Effect of Moistures on Space Charge and Trap Level Characteristics of Oil-Impregnated Pressboards

et al. 2020

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Oil-paper insulation as an irreplaceable insulation system in the electrical power transformer is inevitably suffering the water intrusion on working condition, which will make dielectric performance degraded and insulation aging accelerated. In high interest of explaining the deterioration effect of absorbing moisture on the dielectric properties of oil-paper insulation system and corresponding mechanism, the space charge and trap level characteristics are investigated for the specially prepared oil-impregnated pressboards with different moisture contents. The Pulsed Electro Acoustic and Isothermal Surface Potential Decay experiments are performed to test the space charge distributions and evaluate the trap level depths, respectively. It is indicated that the polarity of injected space charges is alternated with the decaying rate being raised when the absorbing moisture is aggravated in oil-impregnated pressboards. The charge carriers are more prone to be captured by the shallow-level traps that have been introduced by water permeation near pressboard surface than the intrinsic deep-level traps inside pressboard. The captured charge carries accounts for the significantly exacerbated space charge accumulation as manifested by the surface charges of oil-impregnated pressboards.

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Surface charge accumulation and decay on directfluorinated oil-impregnated paper

Cited by 20 publications

References 24 publications

Accelerated Charge Dissipation by Gas-Phase Fluorination on Nomex Paper

Accelerated Charge Dissipation by Gas-Phase Fluorination on Nomex Paper

Investigating the Influence of Different Types of Nanoparticles on Thermal and Dielectric Properties of Insulation in Converter Transformer

Effect of Moistures on Space Charge and Trap Level Characteristics of Oil-Impregnated Pressboards

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