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Research of HTS Cable Termination Prefabricated Stress Cone

Author: ShenZheng
Tutor: FangJin
School: Beijing Jiaotong University
Course: Electrical Engineering
Keywords: HTS cable termination prefabricated stress cone optimizationdesign cryogenic insulation performance test
CLC: TM249.7
Type: Master's thesis
Year: 2014
Downloads: 18
Quote: 0
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Abstract

High temperature superconducting (HTS) cable terminal is the most important component of HTS cable system which is used to connect the HTS cable and the conventional cable accessory. The roles of the stress cone situated in HTS cable termination is improving the distribution of electric field and increasing the electric insulating strength. And the insulating material of stress cone should be able to endure low temperature. This thesis centers on the study of HTS cable termination prefabricated stress cone. The mathematical model and equivalent circuit model of stress-cone were built. The structural parameters of35kV prefabricated stress cone were designed and optimized. The different electric field distribution with different structure of stress cone were analyzed and compared. And the insulating material was formulated and tested. Finally, the prototype of prefabricated stress cone was completed and has been tested.Firstly, the mathematical model and equivalent circuit of stress cone was constructed. Referencing the design method and theory of common cable termination stress cone, HTS cable termination stress cone was designed. And the requirement for the insulating material was proposed.Secondly, the structural parameters of HTS cable termination prefabricated stress cone was optimized and the electric field was simulated. And the losses were analyzed. The influence of each structural parameter on the electric field distribution was analyzed, including the length and the insulating thickness of prefabricated stress cone. Based on the design principle of PSO algorithm, the objective variable, the objective function and constraint condition were built, combining with the finite element analysis software ANSYS, the electric field distribution in the termination was obtained, and the influence of structural parameters on the electric field distribution was gotten. The suitable parameters were obtained by comparing the results of simulated and theoretical analysis. And the losses analysis of the structure was made.Thirdly, the possible defects of the prefabricated stress cone were analyzed. The possible defects, the reasons and the solutions were summarized and analyzed. Simulating the defects of the prefabricated stress cone, the defect models were built and the electric field was simulated. The influence of the defect dielectric and the defect size on the electric field distribution was found. Finally, the insulating material was formulated and has been tested, the prototype of prefabricated stress cone was completed and tested. The insulating material was formulated by suitable proportion, and the breakdown test of insulating material was executed. Then the electric property and the low-temperature property were obtained. On the basis of selecting the suitable low-temperature insulating material and the processing equipment, several prototypes of35kV class prefabricated stress cone were processed. The electrical insulation test has been made on these prototypes. The designed prefabricated stress cone was verified.The study and design of35kV class prefabricated stress cone are the further spread of low-temperature high voltage insulation, the key technology of the medium voltage class HTS cable terminal and the foundation for the research of medium voltage class of HTS cable terminal.

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