If the voltage ranges are unstable (ie: power stays on, but the particular voltage degree differs lots from your 220V typical), then I feel that's the kind of scenario the place an AVR is helpful. For big power units, dynamic uninterruptible power provides (DUPS) are occasionally utilized. A synchronous motor/alternator https://pantip10851.link4blogs.com/55139475/indicators-on-uninterruptible-power-supply-you-should-know