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Does anyone has experience in EHV/UHV GIS expansion? Without any equipped spare available in existing one. From old models to new models? From SF6 to SF& FREE? References?

Any idea that what could happeded? Harmonics issue? No fire resistant concrete walls between power transformers? Sprinkler system was not operational? No redundancy? Others?

Attached file with some photos of buried earthing grid inside concrete foundations.

For a FEED stage do you know which are the minimum deliverables documents (written, drawings and calculations) needed? Is there any standard/rule for it?

Do you usually use in electrical installations extra loop for MV Cables in origin/from and destination/to? I believe that is a good solution in case of an event short circuit at its terminals.

I was checking IEC 62271-200 and I did not find anything about short circuit tolerances. For example SIEMENS MV Switchgear 8DA10 (40,5 kV/2500 A) model has 40 kA (3 sec). For some project we get IK3"= 40,66 kA. What is your experience about it?

My question now is directly use this kind of VSC (Voltage Source Compensation) in Meltshops. As anyone knowledge of this kind of systems in SMPs?