First of all, according to the nature of the equipment to choose the appropriate voltage regulator, the analogy of the equipment is precision instruments, medical equipment and other power requirements are more stringent on the need to choose purified AC voltage regulator. If the equipment is the type of inductive loads need to choose single/three-phase compensated voltage regulator. If only some non-inductive load type, you can choose single/three-phase high-precision regulator. In addition to the selection of regulators need to be appropriately enlarged!