The generation and migration of bubbles in oil-pressboard insulation needle-plate system

Wu, Hongbin and Liu, Hongshun and Xue, Zhitong and Yang, Jingjing and Li, Qingquan and He, Dongxin and Siew, Wah Hoon (2022) The generation and migration of bubbles in oil-pressboard insulation needle-plate system. IEEE Transactions on Dielectrics and Electrical Insulation, 29 (6). pp. 2110-2121. ISSN 1070-9878 (https://doi.org/10.1109/tdei.2022.3210486)

[thumbnail of Wu-etal-IEEETDEI-2022-The-generation-and-migration-of-bubbles-in-oil-pressboard-insulation]
Preview
 Text. Filename: Wu_etal_IEEETDEI_2022_The_generation_and_migration_of_bubbles_in_oil_pressboard_insulation.pdf
Accepted Author Manuscript
License: Strathprints license 1.0
Download (3MB)| Preview

Abstract

Bubbles in transformer oil can easily lead to partial discharge, which can deteriorate the transformer oil and even breakdown the transformer insulation. To clarify the migration process and the characteristics of bubbles generated in an oil-immersed power transformer exposed to an extremely uneven electric field, we experimentally monitor these phenomena under an extremely nonuniform AC electric field and numerically simulate the migration distance and the migration speed of bubbles with different initial positions and sizes. The results show that the streamer discharge channel formed by a partial discharge in oil is gasified into a bubble channel. After it collides with the surface of the pressboard, its morphology is transformed into approximately spherical bubbles due to the surface tension of the gas-liquid interface. After bubbles are generated in the oil, they move away from areas with a strong electric field due to the electric-field force and gradually approach the oil surface due to the buoyancy force. The experimental results are consistent with the simulation results, which verify the rationality of the simulation model.

ORCID iDs

Wu, Hongbin, Liu, Hongshun, Xue, Zhitong, Yang, Jingjing, Li, Qingquan, He, Dongxin and Siew, Wah Hoon ORCID logoORCID: https://orcid.org/0000-0003-4000-6856;
  • Item type:Article
    ID code:82802
    Dates:
    Date
    Event
    27 December 2022
    Published
    27 September 2022
    Published Online
    24 September 2022
    Accepted
    Notes:© 2022 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting /republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
    Subjects:Technology > Electrical engineering. Electronics Nuclear engineering
    Department:Faculty of Engineering > Electronic and Electrical Engineering
    Depositing user: Pure Administrator
    Date deposited:17 Oct 2022 15:14
    Last modified:20 Nov 2024 01:24
    URI:https://strathprints.strath.ac.uk/id/eprint/82802
CORE (COnnecting REpositories)