Effect of Temperature on Space Charge Distribution in Two Layers of Transformer Oil and Impregnated Pressboard Under DC Voltage

Zhang, Jinfeng; Chi, Minghe; Chen, Qingguo; Sun, Weiyi; Cao, Jun

doi:10.1109/access.2020.2967633

Cited by 15 publications

(5 citation statements)

References 21 publications

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“…Although much research has been made on the SCL at the interface between sulfide electrolytes and oxide electrodes, in composite polymer electrolyte and so on, and constructing an extra thin layer at the interface seems to be working in some cases, there is still a long way to go to understand the molecular mechanism and generalize the methodology. As reviewed in this contribution, the SCL effect at the -Mathematical model+constitutive assumption [68] NCM|ipn-PEA (LATP) AFM interfacial potential measurements [51] LiCoO 2 |Li 6 PS 5 Cl (BaTiO 3 ) Differential phase contrast scanning transmission electron microscopy (DPC-STEM) [11] Au|LiCGC Impedance spectroscopy + physical equivalent circuit [12] Cu|LiPON In situ electron holography of electric potentials [73] LCO|LiPON XPS [45] LCO|LATSP|Pt Quantitative electron holography (EH) [70] Cu|LASGTP Phase-shifting electron holography (EH) + spatially resolved electron energy-loss spectroscopy (SR-EELS) [71] Pt|LASGTP Spatially-resolved electron energy-loss spectroscopy in a transmission electron microscope mode (SR-TEM-EELS) [78] LCO|LiPON (LNO) XPS + electrochemical techniques [36] LiCoO 2 |Li 3 PO 4 X-ray techniques + solid-state NMR techniques + neutron scattering techniques [72] oil gap|impregnated pressboard Pulsed electro-acoustic (PEA) method [75] a single layer and multilayer samples Pulse-electroacoustic (PEA) measurements [79] Li x V 2 O 5 |LAGP 2D-EXSY NMR [76] interface between the electrode and solid electrolyte plays a key role in the development of an all-solid-state lithium battery. When the potential chemical gap between the electrolyte and the electrode is large, Li + will migrate to the side with the lower chemical potential, and ions with opposite charges will be replenished on the other side to form an SCL.…”

Section: Discussionmentioning

confidence: 99%

“…This provides new methods and ideas for the study of SCL. In addition, Zhang et al [75] have explored a method to measure the distribution of SCL by using pulsed electroacoustics, as shown in Figure 8. The accumulation and attenuation of monolayer and bilayer space charges at different temperatures are studied, and the distribution of the electric field is calculated according to the distribution of SCL.…”

Section: Experimental Techniques To Characterize the Sclmentioning

confidence: 99%

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Research progress on space charge layer effect in lithium-ion solid-state battery

Zhang

Kong

Gao

et al. 2022

Sci. China Technol. Sci.

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The development of lithium-ion solid electrolyte provides new ideas for solving the safety problems of secondary lithium-ion batteries (LIB) and, at the same time, the improvement of energy density. However, the consequent solid-solid interfacial problems have become a typical bottleneck to the performance. It has been considered that the space charge layer (SCL) formed at the interface to balance the sharp electrochemical inherent difference of properties is one of the most important factors that affect the ion transportation along and across the interface. Its existence may hinder ion transportation and increase the interfacial impedance but may also help to provide a new percolation path for lithium ion and so to enhance the ion migration. However the mechanism of SPL formation and its regulation on ion transport is not very clear, so it has raised a lot of attention and interest from LIB researchers. The purpose of this article is to try to gain some knowledge of SCL and, at the same time to browse through the related research in recent years. Hopefully, it may help those interested in solid electrolyte development for all-solidstate lithium-ion batteries (ASSB) in the future.

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Section: Discussionmentioning

confidence: 99%

Section: Experimental Techniques To Characterize the Sclmentioning

confidence: 99%

Research progress on space charge layer effect in lithium-ion solid-state battery

Zhang

Kong

Gao

et al. 2022

Sci. China Technol. Sci.

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“…A bulk of net negative charges migrate from high temperature area to low temperature area of the oil–paper sample, and more heterocharges appear. This phenomenon becomes more obvious with the increase of temperature gradient [20, 31–33].…”

Section: Algorithm Verificationmentioning

confidence: 99%

Description of space charge transport in oil‐paper insulation using adaptive time‐stepping transient upstream finite element method

et al. 2021

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The charge transport and accumulation in oil-paper can cause the insulation degradation. So far, the most widely used model to simulate space charge transport and accumulation is the bipolar charge transport (BCT) model, which can well simulate the space charge dynamics. However, there are two shortcomings in the algorithms for solving the BCT model. One is that there is almost no use of vectorisation technology, which may increase the complexity of the algorithm, the other is the usage of fixed step size which might bring extra computation cost. In view of this, an adaptive time-stepping transient upstream finite element method (FEM) is developed to solve the BCT model considering trapping/detrapping, as well as the recombination phenomenon under DC condition in this article. Then, a vectorisation technology is used in the method to optimise the algorithm. Moreover, the adaptive time-stepping method is introduced in simulation to reduce computation time and calculation amount. Simulation results are obtained by programing and later presented, which are basically consistent with the corresponding experimental results. Therefore, the proposed method is expected to promote the optimization design of the oil-paper insulation system.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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“…Furthermore, HVDC converter transformers are located between the AC line and the power converters, which results in the generation of a combination of DC and AC voltages in the valve-side of the windings, in addition to harmonics [10]. Thus, the risk of insulation faults increases due to this voltage distortion [11], which is also aggravated by space charge and surface charge accumulation [12,13].…”

Section: Introductionmentioning

confidence: 99%

Study of Discharge Inception and Propagation in Liquid–Solid Insulation System under DC–LI Superimposed Constraints

2022

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High-voltage direct current (HVDC) links are starting to become widely implemented thanks to their interesting advantages such as reduced operation losses, the absence of reactive power, which allows energy transport via underground cables over long distances, and improved power control. The latter advantage is very essential for renewable energy resource integration into power grids. However, a thorough understanding of the behavior of insulation systems for HVDC components is critical so as to ensure a more reliable service. Indeed, the existence of the direct current (DC) voltage in HVDC components may induce surface and space charge accumulation that can stress insulation further or even promote discharge inception and propagation. As such, this work focuses on showcasing the effect of surface charge on streamers that develop on the interface of liquid–solid insulation due to the advent of lightning impulse (LI) voltage in the HVDC link. This study was performed using finite-element-based numerical simulations that include a quasi-electrostatic model for surface charge accumulation and an electrohydrodynamic fluid model for streamer initiation and propagation. The geometry used was point–plane configuration where the high voltage is applied to the needle electrode located above the liquid–solid interface. The obtained results suggest that streamer initiation is affected by both the accumulated surface charge density and polarity. For a positive streamer, an accumulation of positive surface charge increases the discharge inception voltage as a result of a weakening in the electric field, while an accumulation of negative surface charge decreases the discharge inception voltage due to an intensification in the electric field. Moreover, streamer travel distance and velocity are also both shown to be affected by surface charge accumulation.

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Effect of Temperature on Space Charge Distribution in Two Layers of Transformer Oil and Impregnated Pressboard Under DC Voltage

Cited by 15 publications

References 21 publications

Research progress on space charge layer effect in lithium-ion solid-state battery

Research progress on space charge layer effect in lithium-ion solid-state battery

Description of space charge transport in oil‐paper insulation using adaptive time‐stepping transient upstream finite element method

Study of Discharge Inception and Propagation in Liquid–Solid Insulation System under DC–LI Superimposed Constraints

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