When your voltage amounts are unstable (ie: power stays on, but the particular voltage amount varies a whole lot from your 220V conventional), then I feel that's the kind of state of affairs wherever an AVR is helpful. For big power units, dynamic uninterruptible power materials (DUPS) are occasionally applied. https://taifudo-bodyguard83703.losblogos.com/32938561/the-single-best-strategy-to-use-for-uninterruptible-power-supply-pronunciation