How does the electrical industry detect faults (LG, LLG etc) in the transmission grid?
Will be highly obliged if someone can answer the above queries. Thank you
Usually it is done for short-circuit condition in a selected section of the equivalent circuit of the transmission grid.
You can read the following.
https://www.downloads.siemens.com/download-center/download?DLA06_1005
https://www.myprotectionguide.com/uploads/7/3/0/1/73017921/7sa522_catalog_sip_e7.pdf
Book: Ziegler Numerical Distance Protection
Distance relay is used to detect the fault by line impedance.
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Thanks
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