Please Explain your answer with steps Thank you Identify the

Please Explain your answer with steps. Thank you!

Identify the following systems and suggest appropriate forms of main and backup protection for them. Justify your answers. 345 kV system with 30 to 100 mile long lines carrying loadsin 100 to 300 MVA range. 12.47 kV system with 0.5 to 2 mile long lines carrying loads in 1 to 2 MVA range. 115 kV system with 4 to 10 mile long lines carrying loads in 10 to 50 MVA range.

Solution

https://www.slideshare.net/mobile/moiz89/protection-of-transmission-linesdistance-relay-protection-scheme...fallow the link u will get clarity different protection schemes for long lines