Should your voltage degrees are unstable (ie: power stays on, but the actual voltage degree varies a lot in the 220V normal), then I believe that's the type of circumstance the place an AVR is helpful. For big power units, dynamic uninterruptible power materials (DUPS) are sometimes made use of. https://condo-near-me26814.myparisblog.com/34350865/not-known-details-about-uninterruptible-power-supply-definition