Experimental studies on effects of surface morphologies on corona characteristics of conductors subjected to positive DC voltages

Zhu, Jiahui; He, Zichen; Wu, Jiale; Bian, Xingming

doi:10.1049/hve.2019.0317

Cited by 20 publications

(6 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The surface topography of the electrode can significantly affect the distribution of EF, especially near the surface, which can be greatly improved due to the surface microstructure of the electrode. , Thus, the nucleation of the water may vary to great possibility. To further investigate the effect of the local EF enhancement induced by the surface microstructure on freezing, we were motivated to explore the freezing temperature on different substrates with the EFs.…”

Section: Resultsmentioning

confidence: 99%

Microstructure Enhances the Local Electric Field and Promotes Water Freezing

Deng

Wang

Zhou

et al. 2022

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Ice-energy storage technology (IEST) can effectively improve the energy utilization rate and thus reduce carbon emissions, which is valuable and significant for achieving peak carbon dioxide emission and carbon neutrality. However, how to produce a large amount of ice with high efficiency and low energy consumption is the main bottleneck restricting the promotion of IEST. In this paper, poly(dimethylsiloxane) (PDMS) substrates with different microstructures were prepared to investigate water freezing in an electrostatic field. The results show that the nucleation temperature of water is raised with the EF. Furthermore, at an EF of 10 kV/cm, a micro-triangular-prism substrate has the best effect on promoting nucleation. Moreover, the energy consumption during the freezing process is effectively reduced by a combination of applying EF and substrate modification. This work sheds new light on the design of IEST and has potential utilization in food cryopreservation.

show abstract

Section: Resultsmentioning

confidence: 99%

Microstructure Enhances the Local Electric Field and Promotes Water Freezing

Deng

Wang

Zhou

et al. 2022

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Frontiers in Materials frontiersin.org weather (Hylten-Cavallius et al, 1964). In addition, for DC lines, suspended particles with opposite polarity charged will attach to the conductor surface, increasing the surface roughness and reducing corona inception voltage (Jie et al, 2020).…”

Section: Coatings Aim At Conductors Coronamentioning

confidence: 99%

A review on mechanism and application of functional coatings for overhead transmission lines

et al. 2022

View full text Add to dashboard Cite

Overhead transmission line is the main method of power transmission. Conductors, insulators, and towers are the primary electrical equipment of overhead transmission lines. Due to overhead transmission lines work in the natural environment, problems such as icing, corona discharge, contamination deposition, and corrosion will arise. As a result, some accidents may occur, which cause enormous economic losses. The above problems can be solved by coating functional coatings with superhydrophobic, semiconductive, anti-corrosion, and other characteristics on electrical equipment, which has the advantages of low cost and high efficiency. Therefore, functional coatings have become a research hotspot in the field of external insulation in recent years. In view of the various problems of different electrical equipment in overhead transmission lines, distinctive solutions need to be adopted, so this review classifies the coatings according to the usage scenarios and functions. In each category, first briefly outlines the causes of the electrical equipment problem, then introduces the mechanism of using this type of functional coating to solve the problem, next summarizes the development and application status of this type of coating, after summarizes the limitations of this coating, and finally provides a summary of the key issues in the research of functional coatings and gives an outlook on potential future research directions. This review intends to provide readers with a comprehensive overview of the performance principles and current application status of functional coatings for overhead transmission lines.

show abstract

“…occur in the non-uniform high electric field around a sharp edge, loose wire strand or transmission conductor in the power distribution system [40,41]. The type of stator winding structure used in PWM fed actuator is a random-wound stator.…”

Section: Test Cellsmentioning

confidence: 99%

“…They are considered to be representatives of two common sources of PD in aerospace applications [14]. The corona discharge may occur in the non-uniform high electric field around a sharp edge, loose wire strand or transmission conductor in the power distribution system [40,41]. The type of stator winding structure used in PWM fed actuator is a random-wound stator.…”

Section: Test Cellsmentioning

confidence: 99%

Partial discharge detection and identification at low air pressure in noisy environment

2021

View full text Add to dashboard Cite

Increasing demand for electric power in more electric aircraft requires a higher operating voltage for the power system that leads to higher electric stress on the insulation system. Operating at high altitudes where the electrical strength of air is weakened exposes the insulation system to even higher levels of electrical stress. As such, the probability of partial discharges (PD), which result in insulation degradation and failure, is higher. The presence of switching circuits in the power distribution system of the more electric aircraft is capable of producing high levels of noise. This noise in combination with the background noise and parasitic impedances will cause high amplitude ringing in the measured partial discharge signal waveform. Here, a method based on the combination of the wavelet and energy techniques is employed to detect PD pulses in a noisy environment under the low air pressure condition. To verify the technique, a laboratory setup consisting of two separate PD sources mounted in low air pressure (33 kPa) chamber is developed where sine and square waveforms are used as the applied voltage. The obtained results demonstrate that the proposed approach offers low computational complexity, high performance in PD phase localization, and robustness in a noisy environment.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

show abstract

Experimental studies on effects of surface morphologies on corona characteristics of conductors subjected to positive DC voltages

Cited by 20 publications

References 44 publications

Microstructure Enhances the Local Electric Field and Promotes Water Freezing

Microstructure Enhances the Local Electric Field and Promotes Water Freezing

A review on mechanism and application of functional coatings for overhead transmission lines

Partial discharge detection and identification at low air pressure in noisy environment

Contact Info

Product

Resources

About