Abstract
As research and production technologies for high-temperature superconducting (HTS) materials have become increasingly mature, many high-efficiency and low-weight electrical machines made of HTS conductors have been successfully manufactured. In this paper, a transient numerical model for processing a three-phase symmetrical short circuit in a 30-kW HTS generator is proposed. It is based on an electromagnetic and thermal model, coupling the multiphysics of the rotating machinery and magnetic, circuit, and heat transfer modules. Some macroscopic characteristics of the generator, such as the output voltage and current waveforms, can be obtained. It also simulates the microscopic current shunting phenomenon between layers and temperature variation across HTS armature coils during a three-phase symmetrical short circuit fault. Then, some parameters of HTS conductors that are relevant to the temperature rise in coils are considered in this model. This simulation is an effective tool for analysing the transient performance of HTS generators in various fault operating conditions and could correspondingly provide an important guidance for the HTS machines’ preliminary design stage.
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