Grading of electric field distribution of AC polymeric outdoor insulators using field grading material

Zhao, Xiaolei; Yang, Xiao; Hu, Jun; Hai, Wang; Yang, Huaiyuan; Li, Qi; He, Jinliang; Xu, Zhilei; Li, Xinxin

doi:10.1109/tdei.2019.007989

Cited by 36 publications

(12 citation statements)

References 20 publications

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“…Materials with nonlinear dielectric behaviors are applied to rotating electrical machines for the control of the electrical field strength in the insulation system of stator end windings [ 28 ]. Nonlinear conductive materials enable the grading of electric-field distributions in polymeric outdoor insulators, particularly near the high-voltage and ground terminals [ 125 ]. It is also possible to find nonlinear materials in cable accessories [ 22 , 36 , 61 ], such as cable joints and HVDC cable terminations ( Figure 50 ) [ 37 , 126 ].…”

Section: Current Applications Of Nonlinear Polymer Composites In Hv Engineeringmentioning

confidence: 99%

Nonlinear Electrical Conduction in Polymer Composites for Field Grading in High-Voltage Applications: A Review

et al. 2021

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Applications of polymeric materials in electrical engineering increasingly require improvements in operating voltages, performance, reliability, and size reduction. However, the resulting increase on the electric field in electrical systems can prevent achieving these goals. Polymer composites, functionalized with conductive or semiconductive particles, can allow us to reduce the electric field, thus grading the field within the system. In this paper, a comprehensive review of field-grading materials, their properties, and recent developments and applications is provided to realize high-performance high-voltage engineering applications.

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Section: Current Applications Of Nonlinear Polymer Composites In Hv Engineeringmentioning

confidence: 99%

Nonlinear Electrical Conduction in Polymer Composites for Field Grading in High-Voltage Applications: A Review

et al. 2021

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“…the development of novel pulsed power technology. Examples include various geometrical modifications to existing system accessories, the use of surface grading through conductive coatings [1], [2], or the use of field-adaptive grading materials [3]- [6].…”

Section: Introductionmentioning

confidence: 99%

Modeling of the Transient Electric Field in Multilayer Dielectric Composites Under Impulsive HV Energization

Wong

Timoshkin

MacGregor

et al. 2023

IEEE Trans. Dielect. Electr. Insul.

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This article presents the theoretical analysis of composite electrical insulation, formed from layered dielectric materials and subjected to impulsive energization. One-dimensional planar and cylindrical geometries were considered, consisting of an arbitrary number of layers with arbitrary relative permittivity and electrical conductivity. Analytical solutions have been succesfully derived for the time-dependent electric field inside the i-th layer. To demonstrate the usage of the model under complex multilayer topologies where analytical solutions are nontrivial, the characteristics of a 20-layer graded composite under microsecond and sub-microsecond impulses were analyzed and validated against a finite-element solver. Results indicate that the transient electric field response under impulsive energization is strongly dependent on the interplay between the composite relaxation time constants and the characteristic timescales associated with the applied impulse. The model is a further development for the design and coordination of functionally graded materials (FGMs) and composite insulation for high voltage system design. This is particularly relevant under fast-rising impulsive conditions as often encountered in many pulsed power applications.

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“…Timely replacement of insulators with cracks can eliminate hidden troubles, while it cannot fundamentally manage the continuous occurrence of sheath tearing [18,19]. Therefore, it is urgent to conduct a systematic analysis of the tearing problem of high-speed train roof silicone rubber insulator sheath.…”

Section: Introductionmentioning

confidence: 99%

Influence of Sheath Radial Crack on Flashover Arc and Leakage Current of Roof Silicon Rubber Insulator for High-Speed Train

Wang

Zhang

et al. 2022

IEEE Access

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In this paper, three types of insulators with no crack, short crack, and long crack are taken as the research objects to evaluate the influence of the penetrating cracks on the 1 st sheath of the roof silicone rubber composite insulator of high-speed train on the flashover characteristics. The continuous voltage rising method is used to obtain the influence characteristics of the crack on the development process of the flashover arc. The constant voltage withstand method is adopted to compare the leakage current when the contamination degree is 0.1 mg/cm 2 . The test results demonstrate that the crack has no significant effect on the flashover voltage and flashover path, and the flashover arc can burn the edge of the crack. The peak leakage current of the three different tests ranges from 24 mA to 30 mA. Additionally, the development of leakage current can be divided into four stages: rising, continuous violence, falling, and oscillating. Moreover, the sequence of the apparent leakage current of the insulator is long crack insulator, short crack insulator, and the one with no crack. The acceleration of the rising stage of the leakage current increases with the increase in the crack length. Meanwhile, the sum of the time of the rising stage, continuous stage, and falling stage of the insulator with long crack is the smallest. The crack will distort the distribution of current density and the electric field intensity in the vicinity. The results can provide references for evaluating the influence of radial cracks at the edge of the sheath on the flashover characteristics and optimizing the design of the roof insulator sheath structure.INDEX TERMS high-speed train, roof insulator, radial fissure, electric arc, leakage current

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Grading of electric field distribution of AC polymeric outdoor insulators using field grading material

Cited by 36 publications

References 20 publications

Nonlinear Electrical Conduction in Polymer Composites for Field Grading in High-Voltage Applications: A Review

Nonlinear Electrical Conduction in Polymer Composites for Field Grading in High-Voltage Applications: A Review

Modeling of the Transient Electric Field in Multilayer Dielectric Composites Under Impulsive HV Energization

Influence of Sheath Radial Crack on Flashover Arc and Leakage Current of Roof Silicon Rubber Insulator for High-Speed Train

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