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Electric Field Regulation Along Gas–Solid Interface in HVDC GIL with Nonlinear Conductivity Material

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Polymer Insulation Applied for HVDC Transmission

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Abstract

The development of HVDC gas insulated transmission lines (GIL) is the key direction of power transmission for large-scale renewable energy integrations and in specific situations. Under complex conditions, unpredictable surface charge accumulations on spacer surfaces easily cause electric field distortions and even flashovers, threatening the safe operation of the power transmission system. Therefore, regulating the electric field distribution is one of the critical problems for DC-GIL. Nonlinear conductivity materials have the function of regulating the dc electric field distribution, and such insulating materials can be prepared by doping SiC or ZnO particles into polymers. In this chapter, epoxy was doped with SiC particles to prepared epoxy/SiC composites with nonlinear conductivities. Then, the surface nonlinear conductivity spacer was proposed to relax the electric field distortions on spacer surfaces by coating spacers with epoxy/SiC composites. The regulation effects of surface charge and electric field distributions under complex conditions were investigated by simulation. Finally, novels spacers were fabricated and their insulation improvements were verified by flashover tests.

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Authors and Affiliations

  1. Tianjin University, No.92 Weijin Road, Nankai, Tianjin, China

    Hucheng Liang, Boxue Du, Cheng Zhang & Jin Li

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  1. Hucheng Liang
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  2. Boxue Du
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  4. Jin Li
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Correspondence to Hucheng Liang .

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  1. School of Electrical and Information Engineering, Tianjin University, Tianjin, China

    Boxue Du

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Liang, H., Du, B., Zhang, C., Li, J. (2021). Electric Field Regulation Along Gas–Solid Interface in HVDC GIL with Nonlinear Conductivity Material. In: Du, B. (eds) Polymer Insulation Applied for HVDC Transmission. Springer, Singapore. https://doi.org/10.1007/978-981-15-9731-2_17

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  • DOI: https://doi.org/10.1007/978-981-15-9731-2_17

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  • Publisher Name: Springer, Singapore

  • Print ISBN: 978-981-15-9730-5

  • Online ISBN: 978-981-15-9731-2

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