Abstract Appealing advantages of high-temperature superconducting (HTS) transformers are very promising for the contemporary and future power delivery systems. Cryogenic insulation technology is one of the key technologies for their commercialization. In this paper insulation design of the end part of cryogenic high voltage (H. V.) bushing of a 230/20 kV HTS transformer is developed. Analytical relations and finite element method (FEM) modelling, through application of COMSOL Multiphysics software, are employed for determination of electric field distribution in this design process. Weibull 0.1% dielectric breakdown strength has been considered as criterion for insulation design. Different shape and dimension parameters have been tested for mitigation of electric field concentration. A stress cone has been employed to reduce the electric field concentration at the triple point interface of the materials. Additionally, a ring-shaped cut-outs is made on the GFRP-liquid nitrogen boundary to enhance the insulation characteristics.

中文翻译：

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230/20 kV HTS变压器低温高压套管绝缘设计的末端部分

摘要 高温超导 (HTS) 变压器的诱人优势对当代和未来的电力输送系统非常有前景。低温绝热技术是其商业化的关键技术之一。本文开发了230/20 kV HTS变压器低温高压（HV）套管端部的绝缘设计。通过应用 COMSOL Multiphysics 软件，分析关系和有限元法 (FEM) 建模被用于确定该设计过程中的电场分布。Weibull 0.1% 介电击穿强度已被视为绝缘设计的标准。已经测试了不同的形状和尺寸参数以减轻电场集中。应力锥已被用于降低材料三相点界面处的电场集中。此外，在 GFRP-液氮边界上制作了一个环形切口，以增强绝缘特性。