Hydro Generator Stator Bar Modeling and Simulation Based on Finite Element Simulation

Round 1

Reviewer 1 Report

Comments and Suggestions for Authors The paper analysis the role of anti-corona coating in water generator stator bars. The authors uses FEA to investigate the performance of 4 different anti-corona layer configurations. The topic is relevant in the niche field of water generator and addresses a common issue in motor/generator design. It is a relevant application of well-known techniques. The relevant novelty is the adoption of different non-linear characteristics of anti-corona layers, which is somehow missing in the state-of-the-art. The paper lacks of clarity in the definition of the objectives of the work. 1) The abstract is not properly stating the objectives of the performed activity. Please, revise that by simplifying common sentences with the introduction and by clearly stating the different anti-corona layer configuration studied and parameters observed. 2) It will be beneficial to emphasise the role of stator bars in a more generic and reader-friendly way. 3) Currently, the paper presents an application of well-known methodologies an commercial software. Please, clarify the innovation points of the work. 4) The extended description of COMSOL software should be  reduced to the definition of adopted physics, bcs and loads. 5) The stator bar structure studied seems to have a symmetry plane, why the authors did not exploit this to reduce computation time? 6) Figures 6, 7, and 12 label are not describing the content of different configurations. Please, revise the label and the text, in such a way the proper subfigure is referenced in the comment. 7) line 98, wrong referencing of reference 28. 8) Please, consider to include an additional table with the characteristics of all the different configurations (thickness, non-linearity, etc.) 9) Also, consider an experimental validation of the simulations.

Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report

Comments and Suggestions for Authors

Very interesting and useful simulations in COMSOL were made for the Potential distribution on wirebar surface and for the electrical field.

Applying the basic principles of electric circuits and electromagnetic field theory, the electric field distribution at the stator bar end is computed using simulations in COMSOL.

The hydro generator is extremely non-uniform, consequently the existing models cannot accurately reflect the insulation, corona structure.

The topic is relevant to the field addressing numerical simulations instead.

§ Make some theoretical discussions and impediments for the theoretical approach to the subject to calculate the electric/electromagnetic potential.

§ Please note near the equation what notations represent (resistivity, etc.)

§ Please make some comparisons to sustain that “a more accurate mesh generation result was obtained” from line 226.

§ Please specify some additional computing methods developed based on the electric circuit and electromagnetic field theory, and compare with results obtained in the paper, or compare with numerical methods in the field.

§ Complete the conclusions with references to the novelty of the results and the comparison of those existing in the field.

§ Please compare Figure 7 and Figure 12 with other figures from the field.

Accept the paper after the authors make the corrections/revisions on the yellow part above, with comments on the importance of simulations and 3Dscan for the mesh grid, and COMSOL coding and so on, new results on the field were obtained. 

 

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Round 2

Reviewer 2 Report

Comments and Suggestions for Authors

I recommend publication of the paper.