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Insulation failure between the electrical sheets of electrical machines or transformers might occur due to the burrs formed during the cutting process. Together with welding seams or screws used to hold the stack together, the burrs provide a conducting path for eddy currents. In this paper, equivalent conductivities of the EI core with and without interlaminar contacts are determined using 3D finite element computations and measurements. The core loss of the EI core is measured, and the eddy current loss is segregated from the measurements. Based on the acquired eddy current loss, the equivalent conductivities are determined using an iterative approach. In the case of interlaminar fault at one limb, eddy current loss coefficient increased by 2% and in the case of interlaminar fault at two limbs, eddy current loss coefficient increased by 2.7% compared to the healthy case.
|Title of host publication||Proceedings of the 2017 20th International Conference on Electrical Machines and Systems, ICEMS 2017|
|Publication status||Published - 2 Oct 2017|
|MoE publication type||B3 Non-refereed conference publication|
|Event||International Conference on Electrical Machines and Systems - Sydney, Australia|
Duration: 11 Aug 2017 → 14 Aug 2017
Conference number: 20
|Conference||International Conference on Electrical Machines and Systems|
|Period||11/08/2017 → 14/08/2017|
- Eddy current loss
- Finite element method (FEM)
- Interlaminar current
- Three dimensional (3D)
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