Influence of oil aging on the space charge dynamics of oil‐immersed paper insulation under a DC electric field

Hao, Jian; Tang, Chao; Fu, Jin; Wu, Gaolin; Wang, Qian

doi:10.1002/tee.22064

Cited by 8 publications

(4 citation statements)

References 20 publications

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“…In Southampton, Gemini X mineral oil was thermally aged at 130˝C for up to 22 days, and then, preprocessed unaged paper samples were impregnated with oil of different ageing status to form a series of oil-paper insulation samples. After that, the space charge dynamics of these oil-paper samples were investigated using the PEA technique under DC 6 kV (three layers, 210 µm in thickness, 30 kV/mm) [20].…”

Section: Aged Oil + New Papermentioning

confidence: 99%

Progress of Space Charge Research on Oil-Paper Insulation Using Pulsed Electroacoustic Techniques

et al. 2016

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This paper focuses on the space charge behavior in oil-paper insulation systems used in power transformers. It begins with the importance of understanding the space charge behavior in oil-paper insulation systems, followed by the introduction of the pulsed electrostatic technique (PEA). After that, the research progress on the space charge behavior of oil-paper insulation during the recent twenty years is critically reviewed. Some important aspects such as the environmental conditions and the acoustic wave recovery need to be addressed to acquire more accurate space charge measurement results. Some breakthroughs on the space charge behavior of oil-paper insulation materials by the research team at the University of Southampton are presented. Finally, future work on space charge measurement of oil-paper insulation materials is proposed.

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Section: Aged Oil + New Papermentioning

confidence: 99%

Progress of Space Charge Research on Oil-Paper Insulation Using Pulsed Electroacoustic Techniques

et al. 2016

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“…To distinguish between two types of interactions that affect ionic mobility, namely the interaction between the ion and polymer structures and its interaction with external electric fields, the lifetime correlation function L (t) was introduced in this study [44], described as below in Equation (7).…”

Section: Interactions Between the Ion And Its Surrounding Atomsmentioning

confidence: 99%

“…Numerous experimental studies have been conducted to investigate the charge trapping and transport phenomenon in oil‐paper insulation. The accumulation of charge at the oil‐paper interface is a common phenomenon that can be observed in various space charge experiments, including those involving different electric fields [5], ageing conditions [6–9], and impregnation patterns on the oil‐paper insulation [10]. This charge distribution and accumulation near the oil‐paper interface were explained by the formation of an electric double layer (EDL) [11] or surface potential barrier [12] across the interface.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of an impurity ion transport in oil‐paper insulation under various electric fields

Ren,

Wang,

Zhang

et al. 2023

High Voltage

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The ionic transport process is an important counterpart to charge transport in oil‐paper insulation, and it significantly impacts oil flow electrification at the oil‐paper interface. Despite this, the dynamics of this phenomenon and the underlying mechanisms remain unclear, particularly at the molecular level. To understand this fundamental aspect, we conduct Molecular Dynamics study on the transport behaviour of an impurity ion in different oil‐paper insulation models under various external electric fields. Different influence factors, such as external electric fields, temperatures, and local structural characteristics, are investigated in relation to the corresponding ionic mobility in different polymer models. According to the simulations, ionic mobility and its response to electric fields are higher in weaker electrostatic models. As a result, mineral oil exhibits the highest ionic mobility and the most substantial enhancement of ionic mobility by external electric fields, followed by vegetable oil, oil‐paper blends, and insulating paper. This significant deviation in ionic mobility between oil and paper leads to the formation of an electric double layer near the oil‐paper interface. The underlying physical mechanisms of different ionic mobility and its response to the electric field in different polymer models could be explained by the different polymer structural influences in terms of interaction energy and coordination numbers in a static manner, as well as by the interactions between the impurity ion and its surrounding atoms in terms of lifetime correlation functions and velocity autocorrelation functions in a dynamic manner. In addition, the influence of temperature on ionic mobility in mineral and vegetable oil is examined, and their activation energies are calculated. Advancing in the fundamental understanding of the dynamics of the ion transport process in oil‐paper insulation is vital to improving their insulating properties for oil‐impregnated power transformers.

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“…Many previous researches have been carried out to explore the ageing characteristics of oil/papers insulation [10–13 ]. Hao et al [14 ] adopted the pulsed electro‐acoustic technique to investigate the space charge dynamic characteristics for the ageing oil, and the breakdown performances of the cellulose pressboards for the different electrical ageing levels in the composite electrical field were thereafter explored [15 ]. However, few researchers investigate the effects of the nanoparticle mass fractions on the electrical ageing characteristics of the cellulose pressboards.…”

Section: Introductionmentioning

confidence: 99%

Electrical characteristics of the pressboard modified by nano-TiO2 for different electrical ageing stages

Liu

Guo

2020

IET Science, Measurement &Amp; Technology

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In order to seek the optimal mass fraction for the modified pressboards to improve electric ageing resistance ability, the samples modified by nano‐TiO2 with 1, 3, 5 and 7% mass fractions were made in the lab. The electrical ageing experiments were carried on these samples. The dielectric properties tests, partial discharge (PD) and DC breakdown were executed on the samples to analyse the electrical ageing performance of the cellulose pressboards modified by nano‐TiO2. The interface charge accumulation and decay characteristics of the samples were also tested. The nano‐TiO2 distributions and the surface morphology for the cellulose pressboards aged 0 and 40 h were observed by scanning electron microscope (SEM) to verify the modification effect, and the trap density characteristics of unmodified and modified samples were also described. The permittivity and the conductivity properties of the modified samples are more advantageous than the unmodified ones after electrical ageing. The electrical characteristics of the modified samples are better than the unmodified ones for different electrical ageing stages. The analysis of SEM images and trap distribution give a good verification to the improvement of the modified samples for different ageing stages.

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Influence of oil aging on the space charge dynamics of oil‐immersed paper insulation under a DC electric field

Cited by 8 publications

References 20 publications

Progress of Space Charge Research on Oil-Paper Insulation Using Pulsed Electroacoustic Techniques

Progress of Space Charge Research on Oil-Paper Insulation Using Pulsed Electroacoustic Techniques

Dynamics of an impurity ion transport in oil‐paper insulation under various electric fields

Electrical characteristics of the pressboard modified by nano-TiO2 for different electrical ageing stages

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