Electrical properties calculation of HVDC bushing

Chen, X.; Morshuis, P.H.F.; Smit, J.J.; Marquezin, Gwenael; Girodet, A.

doi:10.1109/ceidp.2010.5723959

Cited by 5 publications

(3 citation statements)

References 1 publication

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“…At this time, when the opposite polarity (positive polarity) flows through the conductor, a very large electric field is formed, and a local insulation breakdown phenomenon occurs. Therefore, to measure the dielectric breakdown strength and conductivity, it is very important to measure the resistivity [19].…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Volume and Surface Resistivity Measurement of Insulating Materials Using Guard-Ring Terminal Electrodes

Lee

Kim

2020

Energies

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Recently, eco-friendly energy conversion policies have been being promoted through de-nuclearization and de-coal. For this purpose, a super grid should be built to optimize sustainable renewable energy resources such as solar and wind power. Accordingly, considering the various problems such as technology and cost, a system for efficient energy transmission is required. Hence, research is being actively conducted to apply it, owing to the development of the high voltage direct current (HVDC) system. Among HVDC systems, the cable system is extremely important, in addition to the measurement of the dielectric breakdown strength, space charge, and volume resistivity of insulating materials. The existing resistivity measurement method measures both the volume and surface resistivity using a three-terminal electrode that is used in the international standards of American Society for Testing and Materials (ASTM) D 257 and International Electrotechnical Commission (IEC) 60093. However, the circuit configuration differs depending on the measurement of the volume and surface resistivity; moreover, when a DC voltage is applied to the insulator, a charging current flows and there are multiple samples to be measured, which takes a considerable amount of time. Therefore, in this study, we proposed a new type of resistivity measurement system that is based on the existing three-terminal electrode system. Furthermore, we produced a system capable of simultaneously measuring the volume and surface resistivity. Finally, using this system, we compared and analyzed the volume and surface resistivity of five insulating materials.

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Section: Theoretical Backgroundmentioning

confidence: 99%

Volume and Surface Resistivity Measurement of Insulating Materials Using Guard-Ring Terminal Electrodes

Lee

Kim

2020

Energies

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“…Therefore, simulation is a good way to investigate the electro-thermal coupled field distribution of converter transformer valve side bushings under the actual operation condition. At present, simulation researches for high voltage bushings are mostly concentrated on the single factor of voltage or temperature [8][9][10][11], and due to the large size and complicated structure, related researches about the 3-D temperature distribution characteristics of transformer bushings considering the effect of the thermal conduction, convection and the thermal radiation simultaneously are rare.…”

Section: Introductionmentioning

confidence: 99%

Electro‐Thermal Coupling Field Simulation of Converter Transformer Valve Side Bushings

Wang

Xie

Tian

et al. 2020

IEEJ Transactions Elec Engng

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In the actual operation, converter transformer valve side bushings are subjected to high voltages and large current loads with large number of harmonics simultaneously. In our previous papers, using the 3-D electromagnetic-fluid-thermal coupling analysis method, the 3-D temperature distribution of a converter transformer valve side bushing was researched, and the heating and dissipation characteristics of the bushing were analyzed. However, the electric field distribution of the bushing is affected by the temperature gradient inside the bushing. Related researches about the electro-thermal coupling field of the bushing are rare and most researches are concentrated on the single factor of voltage or temperature. In this paper, by using the electro-thermal coupling field simulation method proposed in our previous paper, the effect of the core outline size on the electric field distribution of the bushing under a certain temperature gradient was investigated. In addition, by using the transient electric field simulation method, the electric field distribution of the bushing in one cycle subjected to an actual voltage waveform and the current in temperature rise test simultaneously was analyzed considering the effect of the Joule heating power of the core. The proposed method will be able to provide a computation basis for the structure design and optimization of converter transformer valve side bushings.

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“…[9] The insulation is mostly damaged due to the formation of cavities which are created T.Prabakaran 2 2 Assistant Professor Sri Manakula Vinayagar Engineering College Puducherry, India prabakaran@rediffmail.com during the installation process. [5] The conductor inside the bushing is generally made with copper, aluminum etc. In the transformer bushing a fixing device is attached to keep the insulation of the bushing in place, since it is one of the highly stressed components of the transformer.…”

Section: Introductionmentioning

confidence: 99%

Electric field calculation and material optimization of 765kV bushing using FEA

AvilaPriya¹,

Kalaiselvam²,

Poongothai³

et al. 2015

2015 International Conference on Computation of Power, Energy, Information and Communication (ICCPEIC)

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Transformer bushings are one of the important components in the construction of high voltage power transmission. The structure and materials used in electrical bushings play a vital role in the durability and lifespan of the bushing. Although the cost of transformer bushing is very minimal in the transmission system extensive damages are caused in case of failure. The main reason of failure in the insulation materials are caused due to moisture ingress and formation of voids, cavities. When the appropriate material is used along with an optimized structure, the electric field is distributed evenly which reduces the stress and increases the longevity of the bushing. In this paper, Finite Element Analysis(FEA) is used to calculate The ELECTRIC FIELD DISTRIBUTION and THERMAL(Temperature) Analysis is done for 765kV transformer bushing by using different insulating materials such as Epoxy Resin, Porcelain, Oil Impregnated Paper, Resin Impregnated Paper and Polymer.Henceforth, by using the above insulating materials the total stress level of the bushings corresponding to the net electric field distribution is in turn calculated using ANSYS 13.0Software. The results are compared and analysis is done for the different insulating materials. Based on the electric field distribution over bushing material, it is used to identify optimization of bushing design.

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Electrical properties calculation of HVDC bushing

Cited by 5 publications

References 1 publication

Volume and Surface Resistivity Measurement of Insulating Materials Using Guard-Ring Terminal Electrodes

Volume and Surface Resistivity Measurement of Insulating Materials Using Guard-Ring Terminal Electrodes

Electro‐Thermal Coupling Field Simulation of Converter Transformer Valve Side Bushings

Electric field calculation and material optimization of 765kV bushing using FEA

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