Research on numerical simulation for partial discharge of epoxy interface excited by high‐frequency sinusoidal voltage

Wang, Jian; Guo, Rui; An, Ping; Liu, Tao; Han, Shuai D.; Li, Qingmin

doi:10.1049/hve2.12156

Cited by 10 publications

(7 citation statements)

References 27 publications

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“…[31]), without knowing the type of defect triggering the PD, the maintenance action loses effectiveness, and Condition-Based Maintenance could be a wasted cost rather than a contribution to the Return on Investment of an electrical asset. In addition, without separating the PD from noise and from other PD sources, identification made by expert systems (such as those using artificial intelligence), rather than expert people, is meaningless [32][33][34][35][36].…”

Section: Discussionmentioning

confidence: 99%

A new approach to the design of surface subsystems of polymeric insulators for HV and MV apparatus under AC voltage

2023

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The design of high voltage and medium voltage AC and DC standoff insulators, and, in general, of insulation systems where surface and interface properties are predominant factors, is based on specifications and standards that rely upon long‐term experiences and lab testing. Surface insulating properties depend on electrical and thermal stresses, besides environmental factors, and the inception of extrinsic ageing phenomena, such as partial discharges, can be already a cause of reduced reliability and premature failure (for organic insulating materials). An innovative approach, based on field simulation, discharge modelling, and partial discharge inception measurements is presented by the authors, which can establish a solid basis to optimise insulation design for any type of supply voltage waveform. This method, the three‐leg approach, is applied here to a cable system under AC sinusoidal voltage, but it can work for any type of insulation system, such as bushings, switch gears, transformers, rotating machines, and power electronics boards.

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Section: Discussionmentioning

confidence: 99%

A new approach to the design of surface subsystems of polymeric insulators for HV and MV apparatus under AC voltage

2023

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“…With the development of power systems and the large-scale application of power electronic conversion equipment [1], the traditional evaluation techniques for insulation performance under DC and low-frequency AC conditions are no longer suitable for high-frequency conditions [2]. The development of new evaluation methods and instruments for the insulation of power equipment in complex stress environments has become a featured research direction in recent years.…”

Section: Introductionmentioning

confidence: 99%

Development of a novel signal restoration algorithm to eliminate the distorted components in space charge measurement excited by femtosecond laser irradiation

Qi,

Ren,

Gao

et al. 2024

High Voltage

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For the space charge measurement method with optical excitation for electrical insulation, the distortion of the excitation laser on the measurement signal and the accumulation of space charge have not been discussed before. Both experiment and simulation results show that three types of distorted components introduced by optical excitation can lead to distortion of the upper interface signal. Further, the factors causing distortion of the measured signal and the formation mechanism are analysed. A virtual electrode potential compensation method and a distorted component extraction method are proposed. Meanwhile, an attenuation restoration and charge conversion correction factor is introduced, leading to a novel signal processing algorithm adapted to space charge optical measurement methods. Compared with the traditional algorithm, the novel algorithm has an error of less than 1% in the calculation of charge and electric field strength, with an increase in accuracy of 47.7% and 9.81%, respectively. By applying the novel restoration algorithm, the comparison shows that the space charge accumulation does not change significantly under laser irradiation, verifying the reliability of the optical excitation. The given algorithm can provide a theoretical and technical foundation for the realisation of the optical measurement method for space charge.

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“…Surface flashover that accompanies a large amount of energy loss generates an arc along the gas-solid interface, and the arc ablates the surface of the insulator, which causes the insulation failure of the surface of a material, and further influences the safe operation of relevant equipment. Therefore, surface flashover is a great threat to advanced applications in various fields, such as basintype insulators and vacuum interrupters in gas-insulatedswitchgear (GIS) [5][6][7][8]/gas-insulated-lines (GIL) [9][10][11], space solar power stations in spacecraft [12,13], high-voltage (HV) pulse applications [14,15], particle accelerators etc. Hence, it is of significance to clarify the surface flashover development process and offer guidance to improve surface flashover performances.…”

Section: Introductionmentioning

confidence: 99%

Surface flashover in 50 years: Theoretical models and competing mechanisms

Liu

Ohki

et al. 2023

High Voltage

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Surface flashover is a devastating electronic avalanche along the gas–solid interface when a high electric field is applied, which is a potential issue that threatens the safe operations of advanced power electronic, electrical, and spacecraft applications. However, the underlying physical mechanisms for surface flashover development are still under investigation owing to the complex charge transport processes through the gas phase, solid phase, and gas–solid interface. In this study, the history of surface flashover theory in the last 50 years is introduced, and several key questions are reviewed from the perspective of the competing mechanisms of charge transport: the role of each phase in a surface flashover, the origin of surface charging, and effects of traps in solid on surface flashover. Then, some suggestions involve charge transport processes in each phase, and their correlations are put forward, and a predictable ‘charge transport competitive flashover model’ is proposed by clarifying the competing mechanisms of charge transport processes through multiple phases. This study summarises the history and hot topics of physical mechanisms of surface flashover proposed based on classic and recent progress and offers promising routes for developing a more precise surface flashover theory and improving surface flashover performances.

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Research on numerical simulation for partial discharge of epoxy interface excited by high‐frequency sinusoidal voltage

Cited by 10 publications

References 27 publications

A new approach to the design of surface subsystems of polymeric insulators for HV and MV apparatus under AC voltage

A new approach to the design of surface subsystems of polymeric insulators for HV and MV apparatus under AC voltage

Development of a novel signal restoration algorithm to eliminate the distorted components in space charge measurement excited by femtosecond laser irradiation

Surface flashover in 50 years: Theoretical models and competing mechanisms

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