Stress Analysis and Bobbin Structure Optimization Design of a 35kV HTS-controllable Reactor

A 35kV high temperature superconducting controllable reactor (HTS-CR) is under development and the electromagnetic design has been completed. Due to the AC conditions, the thermal stress caused by AC losses can be so strong that the stress analysis should be carried out to verify that the maximum stress under different operating conditions is in appropriate range. In addition, Lorentz force of HTS windings will impact the bobbin structure of the HTS windings which will endanger the 35 kV HTS-CR. Stress analysis is important for the design of a mechanically stable structure. This paper provides the analysis of the bobbin structure and its result of optimization design considering the requirements of safety and cooling.