Study of Liquid Nitrogen Insulation Characteristics for Superconducting Transformers

Hu, Min; Zhou, Qibin; Wang, Xueliang; Tang, Feipeng; Sheng, Jie; Bian, Xiaoyan; Jin, Zhijian

doi:10.1109/tasc.2022.3145290

Cited by 1 publication

(1 citation statement)

References 18 publications

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“…With the increase in electrode spacing, the breakdown voltage increases, but the uniformity of the voltage decreases. With the increase in liquid pressure, the breakdown voltage of different electrodes will be increased to some extent [19][20][21]. The withstand voltage experiment on polyimide film in a liquid nitrogen environment was carried out.…”

Section: Introductionmentioning

confidence: 99%

Insulation characteristics of polyimide film used in liquid nitrogen of compact HTS transformers

Zhou,

Xiao,

Bian

et al. 2024

IET Generation Trans & Dist

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Since compact high temperature superconducting (HTS) transformer has a small size and high efficiency, it can meet the requirements of high‐voltage transformers for vehicle‐mounted mobile substation. However, due to the small internal insulation size of the compact HTS transformers, it is necessary to improve the insulation strength to ensure the insulation safety of the transformer. Reasonable main insulation structure can greatly improve the insulation level of transformer. Based on the design theory of main insulation structure, this paper designs a main insulation structure model “small liquid nitrogen gap—barrier” suitable for compact HTS transformer. The insulation withstand voltage experiment of the main insulation structure shows that when the liquid nitrogen gap distance is less than 8 mm, the insulation strength of liquid nitrogen in the structure is improved. When the liquid nitrogen gap distance is too small, the size and thickness of the barrier will affect the insulation strength of the structure. According to the insulation strength of main insulation structures with different liquid nitrogen gaps, the feasibility of “small liquid nitrogen gap—barrier” main insulation structure is verified. The small liquid nitrogen gap structure can be adopted for the main insulation of compact HTS transformer.

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Section: Introductionmentioning

confidence: 99%