Galvanic isolation
On Load Tap Changer (LTC) Explained - saVRee - saVRee
https://www.youtube.com/watch?v=3GaDGdD6XLk
https://twitter.com/energy_charts/status/1453015630303662089/photo/1
inverters and harmonics (case studies of non-linear loads), Jean Noël FIORINA
