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HTS transformer’s partial discharges raised by floating particles and nitrogen bubbles

Moradnouri, A ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1007/s10948-020-05581-4
  3. Publisher: Springer , 2020
  4. Abstract:
  5. Presence of defects, conducting particles, nonconducting particles, and nitrogen gas bubbles in the insulation system of high-temperature superconducting (HTS) transformers, mainly inside the liquid nitrogen as its major insulation, can create local field enhancement and consequently partial discharges which eventually lead to the catastrophic failure of the transformer. In this paper, two-dimensional (2D) axisymmetric finite element method (FEM) modeling via COMSOL Multiphysics software has been utilized for the investigation of the impact of size and shape of conducting particles and nitrogen gas bubbles on partial discharge (PD) activities in liquid nitrogen. Conducting particles of various shapes and the nitrogen bubbles are studied for PD generation. The results have been analyzed and compared. This can be employed for HTS transformer efficiently and PD free insulation design to enhance its insulation life. © 2020, Springer Science+Business Media, LLC, part of Springer Nature
  6. Keywords:
  7. Conducting particle ; Finite element method (FEM) ; High-temperature superconducting (HTS) transformer ; Insulation design ; Liquid nitrogen ; Nitrogen gas bubble ; Partial discharge (PD) ; Bubbles (in fluids) ; High temperature superconductors ; Insulation ; Liquefied gases ; Axisymmetric finite element methods ; Catastrophic failures ; Comsol multiphysics ; Conducting particles ; High temperature superconducting transformers ; Local field enhancement ; Nonconducting particles ; Two dimensional (2 D) ; Partial discharges
  8. Source: Journal of Superconductivity and Novel Magnetism ; Volume 33, Issue 10 , 6 July , 2020 , Pages 3027-3034
  9. URL: https://link.springer.com/article/10.1007/s10948-020-05581-4