EDGE-AI-STUDIO: Edge AI studio Model Composer - Arc fault data

Tool/software:

I would like to create more data with existing PV systems, but I have a couple questions about the arc fault data:

1. What does the 300nF refer to in the CSV file names?
2. What is the difference between files that are used for training, testing and validating?
3. What difference does the data between a 4th order filter and 8th order filter do for the data, and which one should I choose?
4. What does range mean in the graphs and can I change the range in case I want to use an externall current transformers?
5. What is the large peak in the frequency domain, both in the normal and arc files?

Thank you and with kind regards,

Cemil