This once was the dominant type of UPS and is also restricted to around the one hundred fifty kVA array. These units are still mostly employed in a few industrial options (oil and gas, petrochemical, chemical, utility, and heavy market markets) mainly because of the sturdy character on the UPS. https://travisedwpf.xzblogs.com/74586127/5-simple-techniques-for-uninterruptible-power-supply-adalah