When your voltage concentrations are unstable (ie: power stays on, but the actual voltage degree varies a lot in the 220V typical), then I believe that's the type of situation exactly where an AVR is useful. all lessons and interfaces from the superclass hierarchy (e.g. see Java course is existing https://mylesfiihf.vblogetin.com/39491402/a-secret-weapon-for-uninterruptible-power-supply-pdf