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Title: Development and application of magnetic modelling to the design of power devices
Author: Umenei, Aghuinyue Esaindang
ISNI:       0000 0004 2750 7485
Awarding Body: Cardiff University
Current Institution: Cardiff University
Date of Award: 2010
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This thesis examines the use of electromagnetic modelling techniques in the development of realistic models for a saturable core fault current limiter (FCL), which can be extended to other electromagnetic power devices. It includes the use of mathematical, analytical and FEM tools which incorporate magnetic properties of the FCL with the properties of the electrical circuit in which it is placed. Two independent models for a saturable core FCL have been developed on different platforms, validated against measured results, and compared with each other for consistency. The models were incorporated into a time-domain circuitry representation of a power distribution network to assess their performance as predictive representations of the actual device. The electromagnetic models incorporate analytic representations of the non-linear soft ferromagnetic material used in the magnetic cores of the devices obtained from sample measurements. Particular attention is paid to the effects and changes needed by the non-linear equations and data, due to the high-field applications in which they are used. The models also include an improved analytic magnetic field distribution function developed for calculating the variation of magnetic field H in magnetic cores that combines accuracy and speed of computation and offers advantages over conventional finite element calculations. Three dimensional finite element modelling was also used for developing structural improvements to the FCL, such as the effect of various design configurations on the performance of the FCL in the power circuit. A comparative study of the modelling methods employed shows the advantages of each modelling method while underlining some of the challenges faced during the model development This has provided solutions to problems which invariably arise in the modelling design of such electromagnetic devices for applications.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available