Insulation design of HTS transformer with the use of continuous transposed conductor

Abstract

Important key technologies of a high-temperature superconducting (HTS) transformer may include the HTS wire technology, cooling, AC loss reduction, large current technology, and cryogenic temperature insulation. Among them, the cryogenic temperature insulation technology will be specifically a core technology for ensuring reliability for the smaller size, stability, economic efficiency of a HTS transformer.In this paper, we have simulated a HTS transformer applied with continuous transposed conductor, which has been studied as a way of reducing AC loss. Also, we analyzed the insulation composition and considered various characteristics of insulation breakdown in liquid nitrogen. Insulation design was realized in a way of calculating breakdown voltage of 0.1% with Weibull statistical treatment of the obtained experimental results and calculating insulation distance meeting basic impulse insulation level (BIL) 750kV, a target voltage.