Lightning Current Measurement Method Using Rogowski Coil Based on Integral Circuit with Low-Frequency Attenuation Feedback

Comments 1: The presented article contains significant content for the theme and the methodology is appropriate. However, the contribution of the article lacks clarity. I suggest the following reference [L. Ming, Z. Xin, C. Yin, M. Chen and P. C. Loh, "Integrator Design of the Rogowski Current Sensor for Detecting Fast Switch Current of SiC Devices," 2019 IEEE Energy Conversion Congress and Exposition (ECCE), Baltimore, MD, USA, 2019, pp. 4551-4557] in the literature review for comparison with the proposed work.

Response 1: The reference [L. Ming， Z. Xin， C. Yin， M. Chen and P. C. Loh， “Integrator Design of the Rogowski Current Sensor for Detecting Fast Switch Current Current Devices ，” 2019 IEEE Energy Conversion Congress and Exposition （ECCE）， Baltimore， MD， USA， 2019， pp. 4551-4557] was introduced at the end of the second paragraph of section 1, and analysis of its measurement method was conducted. The specific modifications are highlighted in green background at the end of the second paragraph of section 1 in the revised manuscript.

Comments 2:Section 1, paragraph 2: Comment on, or at least reference, the necessary requirements (in values) for  lightning current measurements (approximate frequencies and magnitudes);

Response 2: Approximate values of frequencies and magnitudes of lightning current measurements was given at the second paragraph of section 1. The specific modifications are highlighted in green background and approximate values are highlighted in green font in section 1, paragraph 2 in the revised manuscript .

Comments 3: Section 1, paragraph 2: Define what constitutes low/poor performance with specific values to avoid subjectivity;

Response 3: The description of the specific values of the poor performance was added in Section 1, paragraph 2 in the revised manuscript and marked in green background in the first three places of the second paragraph of section 1, specific values are highlighted in green font.

Comments 4: Section 1, paragraph 3: Remove '...the method is simple and feasible...', this statement should be implicitly understood by the reader;

Response 4: In the revised manuscript, NOT ONLY the sentence '...the method is simple and feasible...' was removed, BUT ALSO the paragraph was rewritten to make the expression clearer. The specific modifications are highlighted in green background in Section 1, paragraph 3 in the revised manuscript.

Comments 5: Section 2: Better explain the 8/20 μs parameter and reference the standard/regulation. The references currently in the text are articles, not standards/regulations. If none exist, then state that this is a consensus value adopted;

Response 5: The 8/20 μs parameter comes from standard IEC 60060-1. According to IEC 60060-1, the 8/20 μs exponential waveform is used as the standard lightning current waveform for equipment testing. The standard has been added in section 2, and information about this standard also has been added in references in the revised manuscript. The modifications highlighted in green background in section 2 of the revised manuscript .

Comments 6: Better explain the coefficients alpha, beta, and tp, and how they are obtained or estimated;

Response 6: The coefficients alpha, beta, and tp are wave front attenuation coefficient, the wave tail attenuation coefficient, the peak time respectively. And these coefficients are empirical values or consensus values , which was obtained through data fitting using a program.

Comments 7: Perform a detailed review of the text, paying attention to spacing, sentence beginnings, and punctuation.

Response 7: In the revised manuscript, spacing, sentence beginnings, and punctuation in this paper have been thoroughly rechecked and revised, and the modifications to individual contents in the article have also been highlighted in green in the revised manuscript .